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.
McGraw-Hill My Math Grade 1 Chapter 6 Review Answer Key
Vocabulary Check
Complete each sentence.
difference
ones
subtract
sum
tens
Question 1.
The answer to an addition problem is called the ________________.
Answer:
The answer to an addition problem is called the sum.
Question 2.
In the number 63, 6 is in the ______________ place.
Answer:
In the number 63, 6 is in the tens place.
Question 3.
You ______________ to find the difference.
Answer:
You subtract to find the difference.
Question 4.
The answer to a subtraction problem is called the _______________.
Answer:
The answer to a subtraction problem is called the difference.
Question 5.
In the number 72, 2 is in the _______________ place.
Answer:
In the number 72, 2 is in the ones place.
Concept Check
Add.
Question 6.
2 tens + 1 ten = ____________ tens
20 + 10 = ______________
Answer:
Explanation:
2 tens + 1 ten = 3 tens
20 + 10 = 30.
Question 7.
6 tens + 3 tens = _______________ tens
60 + 30 = _______________
Answer:
Explanation:
6 tens + 3 tens = 9 tens
60 + 30 = 90.
Count on to Add. Write the sum.
Question 8.
75 + 1 = ______________
Answer:
76
Explanation:
75 = 7 tens 5 ones
Add ones
5 ones + 1 one = 6 ones
The sum is 7 tens and 6 ones that is 76.
Question 9.
36 + 3 = _______________
Answer:
39
Explanation:
36 = 3 tens + 6 ones
Add ones
6 ones + 3 ones = 9 ones
The sum is 3 tens and 9 ones that is 39.
Add.
Question 10.
Answer:
Explanation:
The sum of 62 and 3 is 65.
Question 11.
Answer:
Explanation:
The sum of 37 an d2 is 39.
Question 12.
Answer:
Explanation:
The sum of 54 and 4 is 58.
Subtract.
Question 13.
6 tens – 2 tens = ____________ tens
60 – 20 = _______________
Answer:
Explanation:
6 tens – 2 tens = 4 tens
60 – 20 = 40.
Question 14.
5 tens – 2 tens = ____________ tens
50 – 20 = ____________
Answer:
Explanation:
5 tens – 2 tens = 3 tens
50 – 20 = 30.
Use the number line to help you subtract.
Question 15.
80 – 30 = _____________
Answer:
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 = ______________
Answer:
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
Use the number line to help you subtract.
Question 17.
Cameron has 60 marbles. Eric borrows 30 of them. How many marbles does Cameron have left?
______________ marbles
Answer:
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?
_____________ – ______________ = ______________
_____________ + ______________ = ______________
Answer:
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
Answer:
(C) 28 people
Explanation:
There are 25 people at a park
3 more people come to the park
25 = 2 tens 5 ones
Add ones
5 ones + 3 ones = 8 ones
So, the sum is 2 tens and 8 ones that is 28.
Reflect
Add. Explain your work.
Answer:
Explanation:
The sum of 62 and 3 is 65.
Subtract. Explain your work.
8 tens – 3 tens = _____________ tens
80 – 30 = _______________
Answer:
Explanation:
8 tens – 3 tens = 5 tens
80 – 30 = 50.