We included HMH Into Math Grade 1 Answer Key PDF Module 4 Lesson 5 Use Subtraction to Find an Unknown Addend to make students experts in learning maths.
HMH Into Math Grade 1 Module 4 Lesson 5 Answer Key Use Subtraction to Find an Unknown Addend
I Can use a related subtraction fact to find an unknown addend.
Spark Your Learning
Trina has 7 purple flowers. Robert has some yellow flowers. They have 12 flowers altogether. How many yellow flowers does Robert have?
Answer:
Explanation:
Trina has 7 purple flowers
Robert has some yellow flowers
They have 12 flowers altogether
7 + _ = 12
The related subtraction fact that solves the problem is
12 – 7= 5
So, 7 + 5 = 12
There are 5 yellow flowers.
Have pairs of children choose tools to use to solve the problem and draw to show their work.
Build Understanding
7 kites are in the sky. The rest are on the ground. There are 11 kites altogether. How many kites are on the ground?
7 + 
= 11
A. How can you show the problem?
B. How can you subtract to solve the problem?
___ – ___ = ___
C. How can you use the subtraction fact to find the unknown addend?
7 + __ = 11
D. There are ___ kites on the ground.
Answer:
Explanation:
7 kites are in the sky
The rest are on the ground
There are 11 kites altogether
7 + 
= 11
The related subtraction fact that solves the problem is
11 – 7 = 4
So, 7 + 4 = 11
There are 4 kites on the ground.
Turn and Talk How does using subtraction help you find an unknown addend?
Step It Out
1. 9 owls in a park are small. The rest are big. There are 12 owls in all. How many big owls are in the park?
9 + = 12
A. Subtract the number of small owls from the total number of owls.
B. Use the subtraction fact to help you find the unknown addend.
9 + ___ = 12
C. There are ___ big owls in the park.
Answer:
Explanation:
9 owls in a park are small
The rest are big
There are 12 owls in all
9 + = 12
The related subtraction fact that solves the problem is
12 – 9 = 3
So, 9 + 3 = 12
There are 3 big owls in the park.
Check Understanding Math Board
Use subtraction to find the unknown addend.
Question 1.
9 boys wear blue. The rest wear red. There are 16 boys in all. How many boys wear red?
___ – ___ = ___
9 + ___ = 16
___ boys wear red.
Answer:
16 – 9 = 7
9 + 7 = 16
7 boys wear red
Explanation:
9 boys wear blue
The rest wear red
There are 16 boys in all
9 + ___ = 16
The related subtraction fact that solves the problem is
16 – 9 = 7
So, 9 + 7 = 16
7 boys wear red.
On Your Own
Use subtraction to find the unknown addend.
Question 2.
9 penguins walk on ice. The rest of them swim in water. There are 14 penguins in all. How many penguins swim in water?
9 + 
= 14
= 14
___ penguins swim in water.
Answer:
14 – 9 = 5
9 + 5 = 14
5 penguins swim in water
Explanation:
9 penguins walk on ice
The rest of them swim in water
There are 14 penguins in all
9 + 
= 14
The related subtraction fact that solves the problem is
14 – 9 = 6
So, 9 + 6 = 14
95 penguins swim in water.
Question 3.
Solve 8 + 
= 12.
___ – ___ = ___
8 + ___ = 12
Answer:
12 – 8 = 4
8+ 4 = 12
Explanation:
8 + = 12
The related subtraction fact that solves the problem is
12 – 8 = 4
So, 8 + 4 = 12.
Question 4.
Solve 6 + = 15.
___ -___ = ___
6 + ___ = 15
Answer:
15 – 6 = 9
6 + 9 = 15
Explanation:
6 + = 15
The related subtraction fact that solves the problem is
15 – 6 = 9
So, 6 + 9 = 15.
Question 5.
Solve 8 + = 11.
___ – ___ = ___
8 + ___ = 11
Answer:
11 – 8 = 3
8 + 3 = 11
Explanation:
8 + = 11
The related subtraction fact that solves the problem is
11 – 8 = 3
So, 8 + 3 = 11.
Question 6.
Solve 7 + = 14.
___ – ___ = ___
7 + __ = 14
Answer:
14 – 7 = 7
7 + 7 = 14
Explanation:
7 + = 14
The related subtraction fact that solves the problem is
14 – 7 = 14
So, 7 + 7 = 14.
I’m in a Learning Mindset!
How do children in my class use subtraction to find an unknown addend?