All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 6 Review will give you a clear idea of the concepts.

Vocabulary Check

Complete each sentence.

difference
ones
subtract
sum
tens

Question 1.

Question 2.
In the number 63, 6 is in the ______________ place.
In the number 63, 6 is in the tens place.

Question 3.
You ______________ to find the difference.
You subtract to find the difference.

Question 4.
The answer to a subtraction problem is called the _______________.
The answer to a subtraction problem is called the difference.

Question 5.
In the number 72, 2 is in the _______________ place.
In the number 72, 2 is in the ones place.

Concept Check

Question 6.
2 tens + 1 ten = ____________ tens
20 + 10 = ______________ Explanation:
2 tens + 1 ten = 3 tens
20 + 10 = 30.

Question 7.
6 tens + 3 tens = _______________ tens
60 + 30 = _______________ Explanation:
6 tens + 3 tens = 9 tens
60 + 30 = 90.

Count on to Add. Write the sum.

Question 8. 75 + 1 = ______________
76

Explanation:
75 = 7 tens 5 ones
5 ones + 1 one = 6 ones
The sum is 7 tens and 6 ones that is 76.

Question 9. 36 + 3 = _______________
39

Explanation:
36 = 3 tens + 6 ones
6 ones + 3 ones = 9 ones
The sum is 3 tens and 9 ones that is 39.

Question 10.  Explanation:
The sum of 62 and 3 is 65.

Question 11.  Explanation:
The sum of 37 an d2 is 39.

Question 12.  Explanation:
The sum of 54 and 4 is 58.

Subtract.

Question 13.
6 tens – 2 tens = ____________ tens
60 – 20 = _______________ Explanation:
6 tens – 2 tens = 4 tens
60 – 20 = 40.

Question 14.
5 tens – 2 tens = ____________ tens
50 – 20 = ____________ Explanation:
5 tens – 2 tens = 3 tens
50 – 20 = 30. Question 15.
80 – 30 = _____________ Explanation:
Use a number line to subtract numbers by tens
Start at 80
Count back by tens to find the difference 70, 60, 50
So, 80 – 30 = 50.

Question 16.
90 – 20 = ______________ Explanation:
Use a number line to subtract numbers by tens
Start at 90
Count back by tens to find the difference 80, 70
So, 90 – 20 = 50.

Problem Solving Question 17.
Cameron has 60 marbles. Eric borrows 30 of them. How many marbles does Cameron have left? ______________ marbles Explanation:
Cameron has 60 marbles
Eric borrows 30 of them
Use a number line to subtract numbers by tens
Start at 60
Count back by tens to find the difference 50, 40, 30
So, 60 – 30 = 30
Therefore, Cameron have 30 marbles left.

Subtract. Write the related addition fact.

Question 18.
Sam drew 40 pictures. He gave 20 of them to his dad. How many pictures does Sam have left?
_____________ – ______________ = ______________
_____________ + ______________ = ______________ Explanation:
Sam drew 40 pictures
He gave 20 of them to his dad
Sam drew 40 pictures
He gave 20 of them to his dad
40 – 20 = 20 is the subtraction number sentence
So, Sam have 20 pictures left with him
The related addition fact is 20 + 20 = 40.

Test Practice

Question 19.
There are 25 people at a park. 3 more people come to the park. How many people are at the park in all?
(A) 22 people
(B) 27 people
(C) 28 people
(D) 55 people
(C) 28 people

Explanation:
There are 25 people at a park
3 more people come to the park
25 = 2 tens 5 ones
5 ones + 3 ones = 8 ones
So, the sum is 2 tens and 8 ones that is 28.

Reflect  Explanation:
The sum of 62 and 3 is 65. 