# Into Math Grade 1 Module 4 Lesson 2 Answer Key Represent Related Facts

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

## HMH Into Math Grade 1 Module 4 Lesson 2 Answer Key Represent Related Facts

I Can represent related facts in different ways. I can use related facts to find unknown numbers.

There are 13 sailboats. 8 sailboats have striped sails. The other 5 have white sails. How can you write an addition equation about the sailboats? How can you write a subtraction equation?  Explanation:
There are 13 sailboats
8 sailboats have striped sails
The other 5 have white sails
The addition equation that match with the problem is
8 + 5 = 13
The subtraction equation that match with the problem is
13 – 8 = 5.

Read the problem to children. Have pairs choose tools and work together to show how to write an addition fact and a subtraction fact about the sailboats.

Build Understanding

There are 14 otters. 6 of them are in the water. The rest are on land. How many otters are on land? How can you use a concrete model to show the otters?  B. How can you show all the equations that model the problem? Write the related facts.
____ + ___ = ____ ____ – ___ = ____
____ + ___ = ____ ____ – ___ = ____

Explanation:
There are 14 otters. 6 of them are in the water. The rest are on land
14 – 6 =
Start at 6. Count on till 14
I counted 8 more
6 + 8 = 14
So, 14 – 6 = 8
There are 8 otters on the land.
The equations that model the problem are
6 + 8 = 14,  14 – 6 = 8
8 + 6 = 14,  14 – 8 = 6

C. What is the same about the facts? What is different? Explain, related fact Explanation:
The same things about the related facts is all the numbers are same and the different thing is the operations used.

Turn and Talk How did your concrete model help you write the related facts?
Our concrete model helps us to find one equation.
We can write all the other related facts using the numbers in one equation.

Step It Out

1. How can you show all the equations that model the problem? Write the related facts.  Explanation:
I wrote all the related facts by filling teh empty blanks.

A. Show the two addition facts. ____________  Explanation:
In the first cube train i colored 9 green and 2 blue to show 9 + 2 = 11
In the second cube train i colored 2 green and 9 blue to show 2 + 9 = 11.

THINK: Show the addends in a different order.
B. Show the two subtraction facts.
THINK: Start with 11 Take away 2 or 9.  Explanation:
I started with 11 cubes i took away 2 so, 9 are left
11 – 2 = 9
I started with 11 cubes i took away 9 so, 2 are left
11 – 9 = 2.

C. Use your to complete the related facts.
9 + ___ = 11       11 – 2 = ___
2 + 9 = ___         ___ – ___ = ___
9 + 2 = 11,  11- 2 = 9
2 + 9 = 11,  11 – 9 = 2

Explanation:
I used the cubes i drew above to write all the equations.

Check Understanding math Board

Use Complete the related facts.

Question 1.
7 + ___ = 12 12 – ___ = 7
5 + ___ = 12 ___ – ___ = ___ Explanation:
I used the above cubes to write the related facts
7 + 5 = 12,  12 – 5 = 7
5 + 7 = 12,  12 – 7 = 5.

Question 2.
Model with Mathematics Becca has 13 stickers. 7 of them are dog stickers. The rest are cat stickers.
How many cat stickers does she have? ____ cat stickers

• Write related facts to model the problem.
___ + ___ = ___ ___ – ___ = ___
___ + ___ = ___ ___ – ___ = ___

13 – 7 = 6
6 cat stickers

Explanation:
Becca has 13 stickers
7 of them are dog stickers
The rest are cat stickers
Start at 7. Count on till 13
I counted 6 more
7 + 6 = 13
So, 13 – 7 = 6
There are 6 cat stickers
The related facts of the problem are
7 + 6 = 13,  13 – 7 = 6
6 + 7 = 13,  13 – 6 = 7.

Complete the related facts.
Use if you need to.

Question 3.
3 + 9 = ___ 12 – ___ = 9
9 + ___ = 12 ___ – ___ = ___
3 + 9 = 12,  12 – 3 = 9
9 + 3 = 12,  12 – 9 = 3

Explanation:
Start at 9, Count on 3 more
9, 10, 11, 12
I reach at 12
3 + 9 = 12
So, the equation is 3 + 9 = 12
I can write the other related facts using the above equation.

Question 4.
4 + ____ = 11 11 – 4 = ___
___ + ___ = ____ 11 – 7 = ____
4 + 7 = 11,   11 – 4 = 7
7 + 4 = 11,   11- 7 = 4

Explanation:
Start at 4. Count till 11
4, 5, 6, 7, 8, 9, 10, 11
I counted 7 more
4 + 7 = 11
So, the equation is 4 + 7 = 11
I can write the other related facts using the above equation.

I’m in a Learning Mindset!

What did I learn from the way others used related facts to find unknown numbers?

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