We included HMH Into Math Grade 1 Answer Key PDF Module 1 Lesson 7 Choose a Strategy to Add to make students experts in learning maths.
HMH Into Math Grade 1 Module 1 Lesson 7 Answer Key Choose a Strategy to Add
I Can choose a strategy to solve an addition problem.
Step It Out
There are 8 green bags and 7 red bags. How many bags are there?
1. Oneway: Make a ten to add 8 + 7.
THINK: Add 2 to 8 to make 10. I need to add 7 in all. So, add 5 more.
B. Solve the new equation.
C. So, 8 + 7 = ___
Answer:
Explanation:
There are 8 green bags and 7 red bags
8 + 7 =8 + 2 + 5
10 + 5 = 15
So, 8 + 7 = 15.
2. Another way: Use a doubles fact to help add 8 + 7.
A. 7 + 7 = ___
THINK: 8 + 7 is 1 more.
So,8 + 7 = __
B. There are ___ bags.
Answer:
8 + 7 = 15
Explanation:
7 + 7 = 14
Use doubles fact:
7 + 7 = 14 and 1 more
So, 8 + 7 = 15
There are 15 bags.
Turn and Talk Which of the strategies above did you like better? Explain.
Step It Out
Jo has 3 roses and 4 tulips. How many flowers does she have?
3. One way: Count on to add 3 + 4.
A. THINK: Start on the greater number. What number do you start on? ___
B. Draw the jumps on the number line. How many jumps do you make? ___
C. So, 3 + 4 = __
Answer:
Explanation:
Jo has 3 roses and 4 tulips
I started on the greater number 4
I drew 3 jumps on the number line
4 + 3 = 7
So, 3 + 4 = 7.
4. Another way: Use a doubles fact to help add 3 + 4.
A. 3 + 3 = ___
THINK: 3 + 4 is 1 more.
So, 3 + 4 = ___
B. Jo has __ flowers.
Answer:
3 + 4 = 7
Explanation:
Use doubles fact:
3 + 3 = 6 and 1 more
So, 3 + 4 = 7
Jo has 7 flowers.
9 dogs play. 3 dogs sleep. How many dogs are there?
5. One way: Count on to add 9 + 3.
A. Start with 9. Count on 3 more.
9, ___, ____, ___
B. So, 9 + 3 = ___.
Answer:
9 + 3 = 12
Explanation:
9 dogs play
3 dogs sleep
I Started with 9 and counted on 3 more
9, 10, 11, 12
So, 9 + 3 = 12.
6. Another way: Make a ten to add 9 + 3.
A. THINK: Add 1 to 9 to make 10.
I need to add 3 in all. So, add 2 more.
B. Solve the new equation.
C. So, 9 + 3 = ___
D. There are ___ dogs
Answer:
Explanation:
9 + 3 = 9 + 1 + 2
10 + 2 = 12
So, There are 12 dogs.
Check Understanding Math Board
Use any strategy. Draw to show your work.
Question 1.
7 boys wear blue. 6 boys wear red. How many boys are there?
____ boys
Answer:
Explanation:
7 boys wear blue
6 boys wear red
I drew cubes to show the sum
I used the doubles fact 6 + 6 = 12
So, 7 + 6 = 13.
Therefore, there are 13 boys.
On Your Own
Attend to Precision Use any strategy. Draw to show your work.
2. Julian has 7 marbles. His brother gives him 4 more.
How many marbles does Julian have now?
Julian has ___ marbles.
Answer:
Explanation:
Julian has 7 marbles
His brother gives him 4 more
I started counting on 7
I drew 4 jumps
7 + 4 = 11
So, Julian has 11 marbles.
3. Open Ended Use two different strategies to add.
7 + 8 = ___
Answer:
Explanation:
I used counters and cubes to show the sum 7 + 8
In first picture i drew 7 red counters and 8 yellow counters
So, there are 15 counters in all.
In second picture i used doubles fact
7 + 7 = 14 and 1 more
7 + 8 = 15
So, the sum 7 + 8 = 15.
On Your Own
Use any strategy. Write an equation.
Question 4.
9 children go to the dentist in the morning. 6 children go to the dentist in the afternoon. How many children go to the dentist?
___ + ___ = ___
___ children go to the dentist.
Answer:
Explanation:
9 children go to the dentist in the morning
6 children go to the dentist in the afternoon
I drew counters to show the sum 9 + 6
I drew 9 red counters and 6 yellow counters
I counted all the counters and there are 15 in all
So, 9 + 6 = 15
Therefore, 15 children went to the dentist.
Attend to Precision Use any strategy. Draw to show your work.
Question 5.
Julie has 2 stickers. Her sister gives her 8 more. How many stickers does Julie have now?
___ stickers
Answer:
Explanation:
Julie has 2 stickers
Her sister gives her 8 more
I started at the greater number 8
I made 2 jumps
I reached at 10
So, 8 + 2 = 10
Therefore, Julie have 10 stickers.
Question 6.
Jaylen sees 8 bugs in the sky. He sees 9 bugs on flowers. How many bugs does he see?
____ bugs
Answer:
Explanation:
Jaylen sees 8 bugs in the sky
He sees 9 bugs on flowers
I used doubles fact:
8 + 8 = 16 and 1 more
So, 8 + 9 = 17
Jaylen saw 17 bugs in all.
On Your Own
Question 7.
3 ducks fly south for the winter. Then 8 more ducks join them. How many ducks fly south now?
___ ducks fly south now.
Which strategy did you use to solve the problem? Explain.
Answer:
Explanation:
3 ducks fly south for the winter
Then 8 more ducks join them
I used number line to solve
I started at the greater number 8
I made 3 jumps
I reached at 11
So, 8+ 3 = 11
Therefore, 11 ducks fly south now.
Question 8.
Construct Arguments Choose a strategy you can use to add 6 + 7. Draw or write to show how the strategy works.
Answer:
Explanation:
i drew to show the equation 6 + 7 = 13
I used doubles fact to solve
6 + 6 = 12 and 1 more
So, 6 + 7 = 13.
Use any strategy to add.
Question 9.
4 + 5 = ___
Answer:
Explanation:
I used doubles fact:
I drew 4 cubes blue
4 + 4 = 8
I drew i red cube more
So, 4 + 5 = 9.
Question 10.
9 + 7 = ___
Answer:
Explanation:
I used counters
I drew 9 red counters and 8 yellow counters
There 17 counters in all
So, 9 + 8 = 17.
Question 11.
8 + 5 = ___
Answer:
Explanation:
I used counters
I drew 8 red counters and 5 yellow counters
There 13 counters in all
So, 8 + 5 = 13.
Question 12.
6 + 8 = ___
Answer:
Explanation:
I used make ten strategy
6 + 8 = 8 + 6
8 + 2 + 4
10 + 4 = 14
SO, 6 + 8 = 14.
Question 13.
2 + 9 = __
Answer:
Explanation:
I used number line
I started with the greater number 9
I drew 2 jumps
I reached at 11
So, 2 + 9 = 11.
Question 14.
9 + 0 = ___
Answer:
9
Explanation:
9 + 0
As 0 has no value any if we add any number with 0 the sum will be the same number
9 + 0 = 9.