Engage NY Eureka Math 1st Grade Module 3 Lesson 9 Answer Key

A
Write the missing number.  Question 1.
17 + 1 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (7+1=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 2.
15 + 1 = ☐
16

Explanation:
To add the numbers, add first the one’s place digit. (5+1=6). Now bring down one from ten’s place digit. Hence the answer is 16.

Question 3.
18 + 1 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (8+1=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 4.
15 + 2 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (5+2=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 5.
17 + 2 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (7+2=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 6.
18 + 2 = ☐
20

Explanation:
To add the numbers, add first the one’s place digit. (8+2=0). Now bring down one from ten’s place digit. Hence the answer is 20.

Question 7.
15 + 3 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (5+3=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 8.
5 + 13 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (5+3=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 9.
15 + 2 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (5+2=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 10.
5 + 12 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (5+2=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 11.
12 + 4 = ☐
16

Explanation:
To add the numbers, add first the one’s place digit. (2+4=6). Now bring down one from ten’s place digit. Hence the answer is 16.

Question 12.
13 + 4 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (3+4=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 13.
3 + 14 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (3+4=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 14.
17 + 2 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (7+2=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 15.
12 + 7 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (2+7=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 16.
11 + 9 = ☐
20

Explanation:
To add the numbers, add first the one’s place digit. (1+9=10). Now bring down one from ten’s place digit. Hence the answer is 20.

Question 17.
10 + 9 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (0+9=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 18.
9 + 9 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (4+1=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 19.
7 + 9 = ☐
16

Explanation:
To add the numbers, add first the one’s place digit. (7+9=16). Now bring down one from ten’s place digit. Hence the answer is 16.

Question 20.
8 + 8 = ☐
16

Explanation:
To add the numbers, add first the one’s place digit. (8+8=16). Now bring down carry forward one from ten’s place digit. Hence the answer is 18.

Question 21.
7 + 8 = ☐
15

Explanation:
To add the numbers, add first the one’s place digit. (7+8=15). Now bring down carry forward one from ten’s place digit. Hence the answer is 18.

Question 22.
8 + 5 = ☐
13

Explanation:
To add the numbers, add first the one’s place digit. (8+5=13). Now bring down the carry forward one from ten’s place digit. Hence the answer is 13.

Question 23.
11 + 8 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (1+8=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 24.
12 + ☐ = 17
12+x=17
x=17-12
x=5

Explanation:
First of all, move variable 12 to the right side and subtract it from 17. So the solution we get is 5.

Question 25.
14 + ☐ = 17
14+x=17
x=17-14
x=3

Explanation:
First, move the variable 14 to the right side and subtract it from 17. So the solution we get is 3.

Question 26.
8 + ☐ = 17
8+x=17
x=17-8
x=9

Explanation:
First, move the variable 8 to the right side and subtract it from17. So the solution we get is 9.

Question 27.
☐ + 7 = 16
x+7=16
x=16-7
x=9

Explanation:
First move the variable 7 to the left side and subtract it from 16. So the solution we get is 9.

Question 28.
☐ + 7 = 15
8 + 7 =15

Explanation:
x+7=15
x=15-7
x=8. Hence the answer is 8

Question 29.
9 + 5 = 10 + ☐
9+5 = 10+x
14 = 10+x
14-10 =x
x=4

Explanation:
First, rearrange the terms as 9+ 5=14. Now move the variable 10 to the left side and subtract it from 14. So the solution we get is 4

Question 30.
7 + 8 = ☐ + 9
7+8 = 6+9

Explanation:
First, rearrange the terms as 7+ 8=15. Now move the variable 9 to the left side and subtract it from 15. So the solution we get is 6
15 = x+9
15-9 = x
x=6

B
Write the missing number.  Question 1.
14 + 1 = ☐
15

Explanation:
To add the numbers, add first the one’s place digit. (4+1=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 2.
16 + 1 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 3.
17 + 1 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (7+1=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 4.
11 + 2 = ☐
13

Explanation:
To add the numbers, add first the one’s place digit. (1+1=2). Now bring down one from ten’s place digit. Hence the answer is 13.

Question 5.
15 + 2 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (5+2=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 6.
17 + 2 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (7+2=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 7.
15 + 4 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 8.
4 + 15 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 9.
15 + 3 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 10.
5 + 13 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 11.
13 + 4 = ☐
17

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 12.
14 + 4 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (6+1=7). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 13.
4 + 14 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (4+4=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 14.
16 + 3 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (6+3=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 15.
13 + 6 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (3+6=9). Now bring down one from ten’s place digit. Hence the answer is 17.

Question 16.
11 + 9 = ☐
20

Explanation:
To add the numbers, add first the one’s place digit. (1+9=0). Now add the carry forward 1+1 = 2 and bring down 2 from ten’s place digit. Hence the answer is 20

Question 17.
10 + 9 = ☐
19

Explanation:
To add the numbers, add first the one’s place digit. (0+9=9). Now bring down one from ten’s place digit. Hence the answer is 19.

Question 18.
8 + 9 = ☐
17

Explanation:
Add both the numbers 8+9 =17.  Now bring down one from ten’s place digit. Hence the answer is 17.

Question 19.
9 + 9 = ☐
18

Explanation:
Add both the numbers 9+9 =18. Now bring down one from ten’s place digit. Hence the answer is 18.

Question 20.
9 + 8 = ☐
17

Explanation:
Add both the numbers 9+8 =17. Now bring down one from ten’s place digit. Hence the answer is 17.

Question 21.
8 + 8 = ☐
16

Explanation:
To add the numbers, add first the one’s place digit. (8+8=16). Now bring down one from ten’s place digit. Hence the answer is 16.

Question 22.
8 + 5 = ☐
13

Explanation:
To add the numbers, add first the one’s place digit. (8+5=13). Now bring down one from ten’s place digit. Hence the answer is 13.

Question 23.
11 + 7 = ☐
18

Explanation:
To add the numbers, add first the one’s place digit. (1+7=8). Now bring down one from ten’s place digit. Hence the answer is 18.

Question 24.
12 + ☐ = 18
12 + 6 = 18

Explanation:
To add the numbers, add first the one’s place digit. (2+6=8). Now bring down one from ten’s place digit. Hence the answer is 18.
12+x =18
x =18-12
x=6

Question 25.
14 + ☐ = 18
14 + 4 = 18

Explanation:
First, rearrange the terms as 14+x=18. Now move variable 14 to the right side and subtract it from 18. So the solution we get is 4.
14+x=18
x = 18-14
x = 4

Question 26.
8 + ☐ = 18
8 + 10 = 18

Explanation:
First, rearrange the terms as 8 + x=18. Now move the variable 8 to the right side and subtract it from 18. So the solution we get is 10.
8 + x =18
x = 18-8
x = 10

Question 27.
☐ + 5 = 14
9 + 5 = 14

Explanation:
First, rearrange the terms as x+5=14. Now move variable 5 to the right side and subtract it from 14. So the solution we get is 9.
x+5 =14
x =14 -5
x = 9

Question 28.
☐ + 6 = 15
9 + 6 = 15
x + 6 =15
x =15-6
x = 9
First, rearrange the terms as x+6=15. Now move the variable 6 to the right side and subtract it from 15. So the solution we get is 9.

Question 29.
9 + 6 = 10 + ☐
9 + 6 = 10 + 5

Explanation:
Now, rearrange the terms as 9+5=10+x. Now add 9+5 i.e 14 and move variable 14 to the left side and subtract it from 10. The solution we get is 4.
9+6 = 10 + x
15 = 10+x
15-10 = x
x = 5

Question 30.
6 + 7 = ☐ + 9
6+7 = 4+9

Explanation:
Now, rearrange the terms as 6+7= x+9. Now add 6+7 i.e 13 and move variable 13 to the left side and subtract it from 9. The solution we get is 4.

Eureka Math Grade 1 Module 3 Lesson 9 Problem Set Answer Key

Question 1.
Look at the picture below. How much longer is Guitar A than Guitar B? Guitar A is ______ unit(s) longer than GuitarB.
Guitar A is 1 unit(s) longer than GuitarB.

Explanation:
To measure the guitar length we have to use any object like a paper clip or a toothpick. By using that we can know the length of the guitar A i.e 4 units and Guitar B is 3 units in length. By observing their lengths carefully we would know that Guitar A is 1 unit longer than GuitarB.

Question 2.
Measure each object with centimeter cubes. The blue pen is _____ __________________. The yellow pen is _____ __________________.
The blue pen is 8 cm.
The yellow pen is 10 cm.

Explanation:
Here we have to measure both the objects in centimeter cubes. After measuring, the blue pen is 8 cm in length and the yellow pen is 10 cm in length.

Question 3.
How much longer is the yellow pen than the blue pen?
The yellow pen is _________ centimeters longer than the blue pen.
The yellow pen is 2 centimeters longer than the blue pen.

Explanation:
We have already measured the lengths of each object in centimeter cubes. Therefore the yellow pen is 10 cm long in length and that the blue pen is 8 cm long. Hence by comparing both the length of the objects we could know that the yellow pen is 2 centimeters longer than the blue pen.

Question 4.
How much shorter is the blue pen than the yellow pen?
The blue pen is _________ centimeters shorter than the yellow pen.
The blue pen is 2 centimeters shorter than the yellow pen.

Explanation:
As we know the blue pen is 8 cm long and the yellow pen is 10 cm long. By comparing both the object values we could know that the blue pen is 2 cm shorter than the yellow pen i.e is 10-8 = 2 cm.

Use your centimeter cubes to model each problem. Then, solve by drawing a picture of your model and writing a number sentence and a statement.
Question 5.
Austin wants to make a train that is 13 centimeter cubes long. If his train is already 9 centimeter cubes long, how many more cubes does he need?
Here Austin needs 4 more cubes.

Explanation:
Check the below picture for a better understanding. 9 +_ =13
9 + x =13
x=13-9
x=4

Question 6.
Kea’s boat is 12 centimeters long, and Megan’s boat is 8 centimeters long. How much shorter is Megan’s boat than Kea’s boat?
Megan’s boat is 4 cm shorter than Kea’s boat.

Explanation: 8+x=12
x=12-8
x=4
Megan’s boat is 4 centimeter’s shorter than Kea’s.

Question 7.
Kim cuts a piece of ribbon for her mom that is 14 centimeters long. Her mom says the ribbon is 8 centimeters too long. How long should the ribbon be?
The ribbon should be 6 cm long.

Explanation: 14-8=6
The ribbon should be 6 cm long in length.

Question 8.
The tail of Lee’s dog is 15 centimeters long. If the tail of Kit’s dog is 9 centimeters long, how much longer is the tail of Lee’s dog than the tail of Kit’s dog?
The tail of lee’s dog is 6 cm longer than the tail of kit’s dog.

Explanation:
For a better explanation, we have drawn a picture of the tail which is 15 cm and 9 cm long. Therefore by subtracting 9 from 15 we could get that the tail of lee’s dogs is 6 cm longer than the tail of kit’s dog. 9+x=15
x=15-9
x=6

Eureka Math Grade 1 Module 3 Lesson 9 Exit Ticket Answer Key

Use your centimeter cubes to model the problem. Then, draw a picture of your model.
Mona’s hair grew 7 centimeters. Claire’s hair grew 15 centimeters. How much less did Mona’s hair grow than Claire’s hair?
Mona’s hair is 8 cm shorter than claire’s hair.

Explanation: 15 – 7 = 8 cm. Hence mona’s hair is 8 cm less than claire’s hair.

Question 1.
Look at the picture below. How much shorter is Trophy A than Trophy B? Trophy A is _________ units shorter than Trophy B.
1 unit.

Explanation:
By observing the objects carefully in the given question Trophy A is 1 unit shorter than trophy B.

Question 2.
Measure each object with centimeter cubes. The red shovel is _________ _________________________ The green shovel is ________ ________________________
The red shovel is 6 cm cubes.
The green shovel is 8 cm cubes.

Explanation:
By measuring each of the objects with centimeter cubes we got the values of red and green shovel as 6 cm and 8 cm.

Question 3.
How much longer is the green shovel than the red shovel?
The green shovel is _________ centimeters longer than the red shovel.
The green shovel is 2 centimeters longer than the red shovel.

Explanation:
As we know the values of both objects by just comparing them with one another we could know the green shovel is 2 cm longer than the red shovel.

Use your centimeter cubes to model each problem. Then, solve by drawing a picture of your model and writing a number sentence and a statement.
Question 4.
Susan grew 15 centimeters, and Tyler grew 11 centimeters. How much more did Susan grow than Tyler?
Susan grew 4 cm more than Tyler.

Explanation: 15 – 11 = 4. Hence Susan grew 4 cm more than Tyler.

Question 5.
Bob’s straw is 13 centimeters long. If Tom’s straw is 6 centimeters long, how much shorter is Tom’s straw than Bob’s straw?
Tom’s straw is 7 cm shorter than Bob’s straw.

Explanation: 13 – 6 = 7. Hence Tom’s straw is 7 cm shorter than Bob’s straw.

Question 6.
A purple card is 8 centimeters long. A red card is 12 centimeters long. How much longer is the red card than the purple card?
The red card is 4 cm longer.

Explanation: 12 – 8 = 4 cm. Hence the red card is 4 cm longer than the purple card.

Question 7.
Carl’s bean plant grew to be 9 centimeters tall. Dan’s bean plant grew to be 14 centimeters tall. How much taller is Dan’s plant than Carl’s plant? 