All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 3 Lesson 4 Use Doubles to Add will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 1 Answer Key Chapter 3 Lesson 4 Use Doubles to Add
Explore and Explain
Answer:
Explanation:
I used to model the problem
I build a tower that has 3 red cubes and 3 green cubes
The addition number sentence is 3 + 3 = 6.
Teacher Directions: Use to model. Build a tower that has 3 red cubes and 3 green cubes. Trace your tower. Write the addition number sentence.
See and Show
Addends are the numbers you add. Both addends are the same in a doubles fact.
Helpful Hint
5 + 5 is a doubles fact.
Use to model. Complete the addition number sentence.
Question 1.
____ + ____ = ____
Answer:
3 + 3 = 6
Explanation:
I used  to solve the problem
3 + 3 = 6
It is a doubles fact.
Question 2.
____ + ____ = ____
Answer:
4 + 4 = 8
Explanation:
I used  to solve the problem
4 + 4 = 8
It is a doubles fact.
Add. Circle the doubles facts.
Question 3.
Answer:
Explanation:
7 + 7 = 14
It is a doubles fact
So, i drew a circle around the sum.
Question 4.
Answer:
Explanation:
5 + 5 = 10
It is a doubles fact
So, i drew a circle around the sum.
Question 5.
Answer:
Explanation:
7 + 4 = 11
It is not a doubles fact.
Question 6.
6 + 6 = ____
Answer:
Explanation:
6 + 6 = 12
It is a doubles fact
So, i drew a circle around the sum.
Question 7.
9 + 9 = ____
Answer:
Explanation:
9 + 9 = 18
It is a doubles fact
So, i drew a circle around the sum.
Talk Math Can you use doubles to make a sum of 7?
Answer:
3 + 3 = 6 is a doubles fact
Add 1 to 6
6 + 1 = 7
So, we can use doubles fact and added 1 more to make a sum of 7.
On My Own
Use to model. Complete the addition number sentence.
Question 8.
____ + ____ = ____
Answer:
2 + 2 = 4
Explanation:
I used  to solve the problem
2 + 2 = 4
It is a doubles fact.
Question 9.
____ + ____ = ____
Answer:
6 + 6 = 12
Explanation:
I used  to solve the problem
6 + 6 = 12
It is a doubles fact.
Question 10.
____ + ____ = ____
Answer:
4 + 4 = 8
Explanation:
I used  to solve the problem
4 + 4 = 8
It is a doubles fact.
Question 11.
____ + ____ = ____
Answer:
5 + 5 = 10
Explanation:
I used  to solve the problem
5 + 5 = 10
It is a doubles fact.
Add. Circle the doubles facts.
Question 12.
Answer:
Explanation:
8 + 8 = 16
It is a doubles fact
So, i drew a circle around the sum.
Question 13.
Answer:
Explanation:
9 + 0 = 9
It is not a doubles fact.
Question 14.
Answer:
Explanation:
9 + 9 = 18
It is a doubles fact
So, i drew a circle around the sum.
Question 15.
8 + 3 = ___
Answer:
Explanation:
8 + 3 = 11
It is not a doubles fact.
Question 16.
1 + 5 = ___
Answer:
Explanation:
1 + 5 = 6
It is not a doubles fact.
Question 17.
6 + 6 = ___
Answer:
Explanation:
6 + 6 = 12
It is a doubles fact
So, i drew a circle around the sum.
Question 18.
10 + 10 = ___
Answer:
Explanation:
10 + 10 = 20
It is a doubles fact
So, i drew a circle around the sum.
Question 19.
3 + 3 = ____
Answer:
Explanation:
3 + 3 = 6
It is a doubles fact
So, i drew a circle around the sum.
Question 20.
7 + 1 = ____
Answer:
Explanation:
7 + 1 = 8
It is not a doubles fact.
Problem Solving
Question 21.
4 taxi cabs drove down the road. 4 more taxi cabs drove down the road. How many taxi cabs drove down the road in all?
____ taxi cabs
Answer:
8 taxi cabs
Explanation:
4 taxi cabs drove down the road
4 more taxi cabs drove down the road
Add 4 + 4
The addition sentence is 4 + 4 = 8
So, 8 taxi cabs drove down the road in all.
Question 22.
Emad drove over 1 bridge on his way to school. He drove over 1 more bridge on his way home. How many bridges did Emad drive over in all?
_____ bridges
Answer:
2 bridges
Explanation:
Emad drove over 1 bridge on his way to school
He drove over 1 more bridge on his way home
Add 1 + 1
The addition sentence is 1 + 1 = 2
So, Emad drive over 2 bridges in all.
Write Math Is 3 + 6 a doubles fact? Explain.
_______________________
_______________________
_______________________
_______________________
Answer:
3 + 6 = 9
It is not a doubles fact
In a doubles fact the addends will be same and we double one of the addend to find the sum.
McGraw Hill My Math Grade 1 Chapter 3 Lesson 4 My Homework Answer Key
Practice
Add. Circle the doubles facts.
Question 1.
Answer:
Explanation:
2 + 2 = 4
It is a doubles fact
So, i drew a circle around the sum.
Question 2.
Answer:
Explanation:
4 + 4 = 8
It is a doubles fact
So, i drew a circle around the sum.
Question 3.
Answer:
Explanation:
2 + 9 = 11
It is not a doubles fact.
Question 4.
Answer:
Explanation:
1 + 6 = 7
It is not a doubles fact.
Question 5.
Answer:
Explanation:
5 + 5 = 10
It is a doubles fact
So, i drew a circle around the sum.
Question 6.
Answer:
Explanation:
1 + 1 = 2
It is a doubles fact
So, i drew a circle around the sum.
Question 7.
7 + 7 = ____
Answer:
Explanation:
7 + 7 = 14
It is a doubles fact
So, i drew a circle around the sum.
Question 8.
7 + 2 = ____
Answer:
Explanation:
7 + 2 = 9
It is not a doubles fact.
Add. Circle the doubles facts.
Question 9.
6 + 3 = ____
Answer:
Explanation:
6 + 3 = 9
It is not a doubles fact.
Question 10.
4 + 4 = ___
Answer:
Explanation:
4 + 4 = 8
It is a doubles fact
So, i drew a circle around the sum.
Question 11.
There are 4 tan cats sitting on a fence. 4 black cats are also on the fence. How many cats are on the fence in all?
___ cats
Answer:
8 cats
Explanation:
There are 4 tan cats sitting on a fence
4 black cats are also on the fence
Add 4 + 4
The addition sentence is 4 + 4 = 8
So, 8 cats are on the fence.
Question 12.
There are 5 girls playing hopscotch. The same number of boys are playing catch. How many children are playing in all?
_____ children
Answer:
5 + 5 = 10
Explanation:
There are 5 girls playing hopscotch
The same number of boys are playing catch
Add 5 + 5
The addition sentence is 5 + 5 = 10
So, 10 children are playing in all.
Vocabulary Check
Complete each sentence.
doubles addends
Question 13.
Numbers you add together to find a sum are called ______.
Answer:
addends
Explanation:
Numbers you add together to find a sum are called addends.
Question 14.
Two addends that are the same number are _____
Answer:
doubles
Explanation:
Two addends that are the same number are doubles.
Math at Home Have your child identify things that show doubles such as fingers on both hands, toes on both feet, or windows in a car.