All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 4 Lesson 3 Use Doubles to Subtract will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 1 Answer Key Chapter 4 Lesson 3 Use Doubles to Subtract
Explore and Explain
Answer:
Explanation:
A train with 4 red train cars and 4 yellow train cars is on the tracks
The subtraction number sentence is 4 – 4 = 0.
Teacher Directions: Use to model. A train with 4 red train cars and 4 yellow train cars is on the tracks. The red train cars go to the right and the yellow train cars go to the left. Write the subtraction number sentence.
See and Show
You know how to use doubles facts to add.
Helpful Hint
Think 4 + 4 = 8, so 8 – 4 = 4
You can also use doubles facts to subtract
Add the doubles facts. Then subtract.
Question 1.
Answer:
Explanation:
We can also use doubles facts to subtract
2 + 2 = 4
So, 4 – 2 = 2.
Question 2.
Answer:
Explanation:
We can also use doubles facts to subtract
3 + 3 = 6
So, 6 – 3 = 3.
Question 3.
Answer:
Explanation:
We can also use doubles facts to subtract
5 + 5 = 10
So, 10 – 5 = 5.
Question 4.
Answer:
Explanation:
We can also use doubles facts to subtract
1 + 1 = 2
So, 2 – 1 = 1.
Talk Math How can using doubles facts help you subtract?
Answer:
In addition, “doubles” equations (one number added to the same number) are easy to recall because they are “novel”… they stand out. These doubles equations can also be helpful in subtraction. For example… if we know that 7 + 7 = 14, we can apply that information to 14 – 7.
On My Own
Add the doubles facts. Then subtract.
Question 5.
10 + 10 = ____
20 – 10 = ____
Answer:
10 + 10 = 20
20 – 10 = 10
Explanation:
We can also use doubles facts to subtract
10 + 10 = 20
So, 20 – 10 = 10.
Question 6.
4 + 4 = ____
8 – 4 = ____
Answer:
4 + 4 = 8
8 – 4 = 4
Explanation:
We can also use doubles facts to subtract
4 + 4 = 8
So, 8 – 4 = 4.
Question 7.
Answer:
Explanation:
We can also use doubles facts to subtract
8 + 8 = 16
16 – 8 = 8.
Question 8.
Answer:
Explanation:
We can also use doubles facts to subtract
6 + 6 = 12
So, 12 – 6 = 6.
Question 9.
Answer:
Explanation:
We can also use doubles facts to subtract
5 + 5 = 10
So, 10 – 5 = 5.
Question 10.
Answer:
Explanation:
We can also use doubles facts to subtract
9 + 9 = 18
So, 18 – 9 = 9.
Add or subtract. Draw lines to match the doubles facts.
Question 11.
10 + 10 = ____ 14 – 7 = _____
Answer:
10 + 10 = 20
14 – 7 = 7
Explanation:
We can also use doubles facts to subtract
10 + 10 = 20
7 + 7 = 14
So, 14 – 7 = 7.
Question 12.
9 + 9 = _____ 16 – 8 = ____
Answer:
9 + 9 = 18
16 – 8 = 8
Explanation:
We can also use doubles facts to subtract
9 + 9 = 18
8 + 8 = 16
So, 16 – 8 = 8
Question 13.
8 + 8 = ____ 18 – 9 = ____
Answer:
8 + 8 = 16
18 – 9 = 9
Explanation:
We can also use doubles facts to subtract
8 + 8 = 16
9 + 9 = 18
So, 18 – 9 = 9.
Question 14.
7 + 7 = ____ 20 – 10 = ____
Answer:
7 + 7 = 14
20 – 10 = 10
Explanation:
We can also use doubles facts to subtract
7 + 7 = 14
10 + 10 = 20
So, 20 – 10 = 10.
Problem Solving
Question 15.
Bella sees 18 crabs on the beach. 9 of the crabs go in the ocean. How many crabs does Bella now see on the beach?
____ crabs
Answer:
9 crabs
Explanation:
Bella sees 18 crabs on the beach
9 of the crabs go in the ocean
We can also use doubles facts to subtract
9 + 9 = 18
So, 18 – 9 = 9
Therefore, Bella now see 9 crabs on the beach.
Question 16.
Jose found 14 shells on the beach. He gave 7 of the shells to his brother. How many shells does Jose have left?
____ shells
Answer:
7 shells
Explanation:
Jose found 14 shells on the beach
He gave 7 of the shells to his brother
We can also use doubles facts to subtract
7 + 7 = 14
So, 14 – 7 = 7
Therefore, Jose have left 7 shells.
HOT Problem Chase wrote 13 – 6 = 7 on the board to show a doubles fact. Tell why Chase is wrong. Make it right.
____________________________
____________________________
____________________________
Answer:
6 + 6 = 12 and 12 – 6 = 6
7 + 7 = 14 and 14 – 7 = 7
A doubles fact have same addends
So, 13 – 6 = 7 is not a doubles fact
The right doubles fact is 6 + 6 = 12 or 7 + 7 = 14.
McGraw Hill My Math Grade 1 Chapter 4 Lesson 3 My Homework Answer Key
Practice
Add the doubles facts. Then subtract.
Question 1.
4 + 4 = ____
8 – 4 = ____
Answer:
4 + 4 = 8
8 – 4 = 4
Explanation:
We can also use doubles facts to subtract
4 + 4 = 8
So, 8 – 4 = 4.
Question 2.
9 + 9 = ___
18 – 9 = ____
Answer:
9 + 9 = 18
18 – 9 = 9
Explanation:
We can also use doubles facts to subtract
9 + 9 = 18
So, 18 – 9 = 9.
Question 3.
8 + 8 = ___
16 – 8 = ___
Answer:
8 + 8 = 16
16 – 8 = 8
Explanation:
We can also use doubles facts to subtract
8 + 8 = 16
So, 16 – 8 = 8.
Question 4.
7 + 7 = ___
14 – 7 = ____
Answer:
7 + 7 = 14
14 – 7 = 7
Explanation:
We can also use doubles facts to subtract
7 + 7 = 14
So, 14 – 7 = 7.
Question 5.
3 + 3 = ___
6 – 3 = ___
Answer:
3 + 3 = 6
6 – 3 = 3
Explanation:
We can also use doubles facts to subtract
3 + 3 = 6
So, 6 – 3 = 3.
Question 6.
1 + 1 = ___
2 – 1 = ___
Answer:
1 + 1 = 2
2 – 1 = 1
Explanation:
We can also use doubles facts to subtract
1 + 1 = 2
2 – 1 = 1.
Add the doubles facts. Then subtract.
Question 7.
Answer:
Explanation:
We can also use doubles facts to subtract
5 + 5 = 10
So, 10 – 5 = 5.
Question 8.
Answer:
Explanation:
We can also use doubles facts to subtract
2 + 2 = 4
So, 4 – 2 = 2.
Question 9.
Answer:
Explanation:
We can also use doubles facts to subtract
6 + 6 = 12
So, 12 – 6 = 6.
Question 10.
Answer:
Explanation:
We can also use doubles facts to subtract
10 + 10 = 20
So, 20 – 10 = 10.
Subtract.
Question 11.
Camila has 6 pairs of sunglasses. She breaks 3 of them. How many pairs of sunglasses does she have left?
_____ sunglasses
Answer:
3 sun glasses
Explanation:
Camila has 6 pairs of sunglasses
She breaks 3 of them
We can also use doubles facts to subtract
3 + 3 = 6
6 – 3 = 3
So, Camila have 3 pairs of sunglasses left with her.
Test Practice
Question 12.
Find the matching doubles fact.
9 + 9 = 18
(A) 16 – 9 = 7
(B) 18 – 9 = 9
(C) 7 + 7 = 14
(D) 18 – 9 = 8
Answer:
(B) 18 – 9 = 9
Explanation:
We can also use doubles facts to subtract
9 + 9 = 18
So, 18 – 9 = 9.
Math at Home Write a doubles fact such as 7 + 7 = 14. Ask your child to give you a related subtraction fact.
Answer:
14 – 7 = 7
Explanation:
We can also use doubles facts to subtract
7 + 7 = 14 is a doubles fact
The related subtraction fact is 14 – 7 = 7.