# McGraw Hill My Math Grade 1 Chapter 4 Lesson 1 Answer Key Count Back 1, 2, or 3

All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 4 Lesson 1 Count Back 1, 2, or 3 will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 4 Lesson 1 Count Back 1, 2, or 3

Explore and Explain  Explanation:
There are 5 squirrels playing
3 of the squirrels run away
Count back to subtract
Count back 3
4, 3, 2
So, 5 – 3 = 2
Therefore, 2 squirrels are still playing.

Teacher Directions: Use to model. There are 5 squirrels playing. 3 of the squirrels run away. How many squirrels are still playing? Write the number.

See and Show

You can count back to subtract. Start with 6. Count back 2. Count back and take away cubes from the train. Write the numbers.

Count back to subtract. Use to help.

Question 1.  Explanation:
Count back to subtract
Count back 3
7, 6, 5
The difference of 8 and 3 is 5
So, 8 – 3 = 5.

Question 2.
7, ____
7 – 1 = ____ Explanation:
Count back to subtract
Count back 1
6
The difference of 7 and 1 is 6
So, 7 – 1 = 6.

Question 3.
4, ___, ____
4 – 2 = ____ Explanation:
Count back to subtract
Count back 2
3, 2
The difference of 4 and 2 is 2
So, 4 – 2 = 2.

Question 4.
12, ____, ____
12 – 2 = ____ Explanation:
Count back to subtract
Count back 2
11, 10
The difference of 12 and 2 is 10
SO, 12 – 2 = 10.

Question 5.
10, ____, ___, ____
10 – 3 = ____ Explanation:
Count back to subtract
Count back 3
9, 8, 7
The difference of 10 and 3 is 7
So, 10 – 3 = 7.

Talk Math How do you count back to find 7 – 2?
7- 2 = 5

Explanation:
Count back to subtract
Count back 2
6, 5
The difference of 7 and 2 is 5
So, 7 – 2 = 5.

On My Own

Count back to subtract, Use to help. Question 6.
11 – 2 = ____ Explanation:
Count back to subtract
Count back 2
10, 9
The difference of 11and 2 is 9
So, 11 – 2 = 9.

Question 7.
12 – 3 = ___ Explanation:
Count back to subtract
Count back 3
11, 10, 9
The difference of 12 and 3 is 9
So, 12 – 3 = 9.

Question 8.
3 – 2 = ___ Explanation:
Count back to subtract
Count back 2
2, 1
The difference of 3 and 2 is 1
So, 3 – 2 = 1.

Question 9.
10 – 3 = ____ Explanation:
Count back to subtract
Count back 3
9, 8, 7
The difference of 10 and 3 is 7
So, 10 -3 = 7.

Question 1o.
9 – 3 = ___ Explanation:
Count back to subtract
Count back 3
8, 7, 6
The difference of 9 and 3 is 6
So, 9 – 3 = 6.

Question 11.
4 – 1 = ____ Explanation:
Count back to subtract
Count back 1
3
The difference of 4 and 1 is 3
So, 4 – 1 = 3.

Question 12.
6 – 1 = ____ Explanation:
Count back to subtract
Count back 1
5
The difference of 6 and 1 is 5
So, 6 – 1 = 5.

Question 13.
11 – 3 = ____ Explanation:
Count back to subtract
Count back 3
10, 9, 8
The difference of 11 and 3 is 8
So, 11 – 3 = 8.

Question 14.
7 – 3 = ___ Explanation:
Count back to subtract
Count back 3
6, 5, 4
The difference of 9 and 3 is 4
So, 7 – 3 = 4.

Question 15.
9 – 2 = ____ Explanation:
Count back to subtract
Count back 2
8, 7
The difference of 9 and 2 is 7
So, 9 – 2 = 7.

Question 16.  Explanation:
The difference of 10 and 2 is 8.

Question 17.  Explanation:
The difference of 9 and 2 is 7.

Question 18.  Explanation:
The difference of 8 and 1 is 7.

Question 19.  Explanation:
The difference of 12 and 2 is 10.

Question 20.  Explanation:
The difference of 10 and 1 is 9.

Question 21.  Explanation:
The difference of 5 and 3 is 2.

Problem Solving

Write a subtraction number sentence to solve.

Question 22.
There are 5 pelicans sitting on a rock. 1 of them flies away. How many pelicans are still sitting on the rock?
_____ – ____ = ____ pelicans Explanation:
There are 5 pelicans sitting on a rock
1 of them flies away
Count back to subtract
Count back 1
4
The difference of 5 and 1 is 4
So, 5 – 1 = 4
4 pelicans are still sitting on the rock.

Question 23.
There are 11 boats at the dock. 3 of the boats leave. How many boats are still at the dock? ____ – ____ = ____ boats Explanation:
There are 11 boats at the dock
3 of the boats leave
Count back to subtract
Count back 3
10, 9, 8
The difference of 11 and 3 is 8
So, 11 – 3 = 8
8 boats are still at the dock.

Write Math How do you count back to find 11 – 2? Explain.
_______________________
_______________________
_______________________
_______________________
Count back to subtract
Count back 2
10, 9
So, 11 – 2 = 9.

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

Practice

Count back to subtract.

Question 1.
7, ____, _____
7 – 2 = _____ Explanation:
Count back to subtract
Count back 2
6, 5
The difference of 7 and 2 is 5
So, 7 – 2 = 5.

Question 2.
9, ____, ____, ____
9 – 3 = ____ Explanation:
Count back to subtract
Count back 3
8, 7, 6
The difference of 9 and 3 is 6
So, 9 – 3 = 6.

Question 3.
12, ___, ___, ____
12 – 3 = ____ Explanation:
Count back to subtract
Count back 3
11, 10, 9
The difference of 12 and 3 is 9
So, 12 – 3 = 9.

Question 4.
11, ___, ____
11 – 2 = ___ Explanation:
Count back to subtract
Count back 2
10, 9
The difference of 11 and 2 is 9
So, 11 – 2 = 9.

Count back to subtract.

Question 5.
11 – 3 = ____ Explanation:
Count back to subtract
Count back 3
10, 9, 8
The difference of 11 and 3 is 8
So, 11 – 3 = 8.

Question 6.
8 – 1 = ____ Explanation:
Count back to subtract
Count back 1
7
The difference of 8 and 1 is 7
So, 8 – 1 = .

Question 7.
5 – 2 = ___ Explanation:
Count back to subtract
Count back 2
4, 3
The difference of 5 and 2 is 3
So, 5 – 2 = 3.

Question 8.
12 – 2 = ____ Explanation:
Count back to subtract
Count back 2
11, 10
The difference of 12 and 2 is 10
So, 12 – 2 = 10.

Question 9.
10 – 3 = ____ Explanation:
Count back to subtract
Count back 3
9, 8, 7
The difference of 10 and 3 is 7
So, 10 – 3 = 7.

Question 10.
9 – 2 = ____ Explanation:
Count back to subtract
Count back 2
8, 7
The difference of 9 and 2 is 7
So, 9 – 2 = 7.

Question 11.  Explanation:
The difference of 8 and 3 is 5.

Question 12.  Explanation:
The difference of 12 and 1 is 11.

Question 13.  Explanation:
The difference of 11 and 2 is 9.

Question 14.  Explanation:
He lost 3 of them
Start at 9
Count back 3
8, 7, 6
I reach at 6
So, London is left with 6 marks.

Vocabulary Check

count back count on

Question 15.
Start at the number 6 and ____ by 2 to get the difference of 4.
Start at the number 6 and count back by 2 to get the difference of 4.

Math at Home Write 12 – 3 = ___. Have your child write the answer and explain how to count back to solve the problem.