We included HMH Into Math Grade 1 Answer Key PDF Module 2 Lesson 4 Add to Subtract to make students experts in learning maths.

I Can use addition to solve a subtraction problem.

Elena has 7 apples. Ian has 1 apple. Elena gives 6 of her apples to Ian. How can you show the number of apples each child has now?   Explanation:
Elena has 7 apples. Ian has 1 apple
Elena gives 6 of her apples to Ian
I drew counters to show
7 – 6 = 1
Elena have 1 apple now
1 + 6 = 7
Ian have 7 apples now.

Read the problem aloud. Have pairs work together to show and solve the problem. Then invite children to tell what they notice about the numbers in the addition and subtraction equations.

Build Understanding

Helena has 8 oranges. 5 are in a bag. The rest are in a bowl. How many oranges are in a bowl?
8 – 5 =  A. How can you show the problem as addition?  ___ + ___ = ___
C. So, 8 – 5 = ___
D. There are ___ oranges in the bowl.

Explanation:
There are 8 oranges in all
There are 5 in bag
THINK: If I have 5, how many more to make 8?
5 + 3 = 8
Use the addition fact to help subtract.
8 – 5 = 3
So, there are 3 oranges in the bowl.

Step It Out

1. Trino writes 10 postcards. 6 are in the mail. The rest are on her desk. How many postcards are on her desk? Use addition to subtract 10 – 6.
A. THINK: If I have 6, how many more to make 10?
6 + __ = 10 B. Use the addition fact to help subtract.
So, 10 – 6 = ___. C. ____ postcards are on her desk.
Trino writes 10 postcards. 6 are in the mail
The rest are on her desk
THINK: If I have 6, how many more to make 10?
6 + 4 = 10
Use the addition fact to help subtract.
So, 10 – 6 = 4
Therefore, there are 6 postcards on the desk.

Check Understanding Math Board

Add to subtract. Use or if you need to.

Question 1.
Vito has 12 seashells. 5 are big. The rest are small. How many small seashells does he have?
12 – 5 = 5 + ___ = 12
So, 12 – 5 = __
___ small seashells
7 small seashells

Explanation:
12 – 5 =
THINK: If I have 5, how many more to make 12?
5 + 7 = 12
Use the addition fact to help subtract.
So, 12 – 5 = 7
Therefore, there are 7 small seashells.

Add to subtract. Use or if you need to.

2. Sophia makes 7 candles. 4 are tall. The rest are short. How many short candles does she make? 7 – 4 = 4 + __ = 7
So, 7 – 4 = __.
___ short candles
3 short candles

Explanation:
7 – 4 =
THINK: If I have 4, how many more to make 7?
4 + 3 = 7
Use the addition fact to help subtract.
7 – 4 = 3
Therefore, there are 3 short candles.

Write addition and subtraction equations to solve.

Question 3.
Model with Mathematics Fred has 16 bells. 8 of the bells are blue. The rest are purple. How many purple bells does he have?
___ + ___ = ___
So, ___ – ___ = ___
____ purple bells
8 purple candles

Explanation:
16 – 8 =
THINK: If I have 8, how many more to make 16?
8 + 8 = 16
Use the addition fact to help subtract.
So, 16 – 8 = 8
Therefore, Fred have 8 purple bells.

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