McGraw Hill My Math Grade 1 Chapter 4 Lesson 4 Answer Key Problem-Solving Strategy: Write a Number Sentence

All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 4 Lesson 4 Problem-Solving Strategy: Write a Number Sentence will give you a clear idea of the concepts.

McGraw-Hill My Math Grade 1 Answer Key Chapter 4 Lesson 4 Problem-Solving Strategy: Write a Number Sentence

There are 6 seagulls flying seagulls flying over the ocean. 2 of the seagulls land in the ocean. How many seagulls are still flying?

1. Understand Underline what you know. Circle what you need to find.
2. Plan How will I solve the problem?
3. Solve I will write a number sentence.
4. Check Is my answer reasonable? Explain.
   _____ ___ ____ seagulls

Answer:

6 2 4

Explanation:
We know that there are 6 seagulls flying seagulls flying over the ocean
2 of the seagulls land in the ocean
We need to find the number of seagulls still flying
Subtract 2 from 6
6 – 2 = 4 is the subtraction number sentence that solves the problem
So, 4 seagulls are still flying
2 + 4 = 6
So, my answer is reasonable.

Practice the Strategy

There are 11 children building sand castles on the beach. 3 of the children go home. How many children are still building sand castles?

1. Understand Underline what you know, circle what you need to find.
2. Plan How will I solve the problem?
3. Solve I will…
_____ ___ ____ Children
4. Check Is my answer reasonable? Explain.

Answer:

11 3 8

Explanation:
We know that there are 11 children building sand castles on the beach
3 of the children go home
We need to find the number of children still building sand castles
Subtract 3 from 11
11 – 3 = 8 is the subtraction number sentence that solves the problem
So, 8 children are still building sand castles
3 + 8 = 11
So, my answer is reasonable.

Apply the Strategy

Write a subtraction number sentence to solve.

Question 1.
Isaac bought 12 shells. He lost 6 of the shells. How many shells does Isaac have now?
_____ ___ ____ shells

Answer:

12 6 6.

Explanation:
We know that Isaac bought 12 shells
He lost 6 of the shells
We need to find the number of shells Isaac have now
Subtract 6 from 12
12 – 6 = 6 is the subtraction number sentence that solves the problem
So, Isaac have 6 shells now
6 + 6 = 12
So, my answer is reasonable.

Question 2.
Juan found 11 starfish on the beach. He gave 4 of them to his sister. How many starfish does Juan have now?
_____ ___ ____ starfish

Answer:

11 4 7

Explanation:
We know that Juan found 11 starfish on the beach
He gave 4 of them to his sister
We need to find the number of starfish Juan have now
Subtract 4 from 11
11 – 4 = 7 is the subtraction number sentence that solves the problem
So, Juan have 7 starfish now
4 + 7 = 11
So, my answer is reasonable.

Question 3.
There are 10 sea horses swimming together. 8 of them swim away. How many sea horses are still swimming together?
_____ ___ ____ sea horses

Answer:

10 8 2

Explanation:
We know that there are 10 sea horses swimming together
8 of them swim away
We need to find the number of horses that still swimming together
Subtract 8 from 10
10 – 8 = 2 is the subtraction sentence that solves the problem
So, 2 sea horses are still swimming together
8 + 2 = 10
So, my answer is reasonable.

Review the Strategies

Choose a strategy

• Write a number sentence.
• Draw a diagram.
• Act it out.

Question 4.
Brody saw 12 jellyfish in the ocean. Hunter saw 7 jellyfish there. How many more jellyfish did Brody see than Hunter?
____ jelly fish
Answer:

12 7 5

Explanation:
We know that Brody saw 12 jellyfish in the ocean
Hunter saw 7 jellyfish there
We need to find the number of jellyfish Brody see than Hunter
Subtract 7 from 12
12 – 7 = 5 is the subtraction number sentence that solves the problem
So, Brody sees 5 more Jellyfish than Hunter
7 + 5 = 12
So, my answer is reasonable.

Question 5.
There are 5 alligators swimming. 3 of them get out of the water. How many of the alligators are still swimming?

____ alligators
Answer:

5 3 2

Explanation:
We know that there are 5 alligators swimming
3 of them get out of the water
We need to find the number of alligators still swimming
Subtract 3 from 5
5 – 3 = 2 is the subtraction number sentence that solves the problem
So, 2 alligators are still swimming
3 + 2 = 5
So, my answer is reasonable.

Question 6.
Lina had 10 sandals. She gave away 6 of them. How many sandals does Lina have left?
_____ sandals
Answer:

10 6 4

Explanation:
We know that Lina had 10 sandals
She gave away 6 of them
We need to find the number of sandals Lina have left
Subtract 6 from 10
10 – 6 = 4 is a subtraction number sentence that solves a problem
So, Lina have 4 sandals left
6 + 4 = 10
So, my answer is reasonable.

McGraw Hill My Math Grade 1 Chapter 4 Lesson 4 My Homework Answer Key

Problem Solving

Underline what you know. Circle what you need to find. Write a subtraction number sentence to solve.

Question 1.
There are 9 flamingos in the water. 5 flamingos get out. How many flamingos are still in the water?

____ ____ ____ flamingos
Answer:

9 5 4 flamingos

Explanation:
We know that there are 9 flamingos in the water
5 flamingos get out
We need to find the number of flamingos still in water
Subtract 5from 9
9 – 5 = 4 is the subtraction number sentence that solve the problem
So, 4 flamingos are still in the water
5 + 4 = 9
So, my answer is reasonable.

Question 2.
13 stingrays are swimming together. 4 of them swim away. How many stingrays are still swimming together?
____ ____ ____ stingrays
Answer:

13 4 9 stingrays

Explanation:
We know that 13 stingrays are swimming together
4 of them swim away
We need to find the number of stingrays still swimming together
Subtract 4 from 13
13 – 4 = 9 is the subtraction number sentences that solves the problem
So, 9 stingrays re still swimming together
4 + 9 = 13
So, my answer is reasonable.

Question 3.
Sydney saw 11 hermit crabs on the beach. Noah saw 6 hermit crabs there. How many more hermit crabs did Sydney see?
____ ____ ____ hermit crabs
Answer:

11 6 5 hermit crabs

Explanation:
We know that Sydney saw 11 hermit crabs on the beach
Noah saw 6 hermit crabs there
We need to find the number of hermit crabs Sydney see than Noah
Subtract 6 from 11
11 – 6 = 5 is the subtraction number sentence that solve the problem
So, Sydney see 5 more hermit crabs
6 + 5 = 11
So, my answer is reasonable.

Math at Home Give your child a subtraction problem about things around the house. Have him or her write a subtraction number sentence to solve the problem.