Go through the Math in Focus Grade 1 Workbook Answer Key Cumulative Review for Chapters 16 and 17 to finish your assignments.

## Math in Focus Grade 1 Cumulative Review for Chapters 16 and 17 Answer Key

**Concepts and Skills**

**Count in tens and ones. Fill in the blanks.**

Question 1.

Answer:

10,20,30,40,50,60,70,80,81,82,83,84.

Explanation:

In the above image, we can see that there are 8 tens and 4 ones which is 84. And also can be written as 10,20,30,40,50,60,70,80,81,82,83,84.

**Write the number in words.**

Question 2.

57 ___________

Answer:

57 in words is Fifty seven.

Question 3.

93 _____________

Answer:

93 in words is Ninety-three.

**Write the number.**

Question 4.

forty-eight ____________

Answer:

Forty-eight in number is 48.

Question 5.

sixty-nine _____________

Answer:

Sixty-nine in number is 69.

**Fill in the blanks.**

Question 6.

4 and 90 make _____________

Answer:

94

Explanation:

4 and 90 make 90+4 = 94.

Question 7.

____________ and 5 make 75.

Answer:

70.

Explanation:

70 and 5 make 75.

**Estimate. Then count.**

Question 8.

Estimate _____________

Count ____________

Answer:

Estimate: 50

Count: 45.

Explanation:

In the above image, we can see that there are 5 groups with 10 items. So the estimated count is 5×10 which is 50 and the actual count is 45.

**Fill in the blanks.**

Question 9.

___________ = ____________ tens __________ ones

Answer:

57 = 5 tens 7 ones.

Explanation:

In the above image, we can see that there are 5 tens and 7 ones which is 57.

Count the base-ten blocks. Fill in the blanks.

Question 10.

___________ = ____________ tens __________ ones

___________ + ___________ = ___________

Answer:

86 = 80+6.

80+6 = 86.

Explanation:

In the above image, we can see that there are 8 tens and 6 ones which is 86.

80+6 = 86.

**Fill in the place-value charts.**

Question 11.

Answer:

27 = 2 tens and 7 ones.

Explanation:

Here, place value is a value represented by a digit in a number on the basis of its position in the number. So the place value of 27 is 2 in the tens place and 7 in ones place.

Question 12.

Answer:

83 = 8 tens and 3 ones.

Explanation:

Here, place value is a value represented by a digit in a number on the basis of its position in the number. So the place value of 83 is 8 in the tens place and 3 in ones place.

**Find the missing numbers.**

Question 13.

2 more than 54 is ____________.

Answer:

56.

Explanation:

2 more than 54 is 54+2 which is 56.

Question 14.

3 less than 65 is ____________.

Answer:

62.

Explanation:

3 less than 65 is 65-3 which is 62.

Question 15.

____________ is 2 more than 55.

Answer:

57.

Explanation:

57 is 2 more than 55.

Question 16.

____________ is 2 less than 63.

Answer:

61.

Explanation:

61 is 2 less than 63.

Question 17.

Answer:

The missing digits are 80,85,95.

Explanation:

The missing digits are 80,85,95.

**Compare. Fill in the blanks.**

Question 18.

Set ____________ is ____________ more than Set ____________.

Answer:

Set A is 7 more than Set B.

Question 19.

Set ____________ has more.

Answer:

Set A has more.

**Color the greater number.**

Question 20.

Answer:

80 is greater.

Explanation:

In the above numbers, 80 is greater than 71.

Question 21.

Answer:

54 is greater.

Explanation:

In the above numbers, 54 is greater than 45.

**Color the number that is less.**

Question 22.

Answer:

71 is less.

Explanation:

In the above numbers, 71 is less than 80.

Question 23.

Answer:

89 is less.

Explanation:

In the above numbers, 89 is less than 91.

**Fill in the blanks.**

Question 24.

The least number is ____________.

The greatest number is ___________.

Answer:

The least number is 15.

The greatest number is 41.

Explanation:

In the above numbers, the least number is 15 and the greatest number is 41.

**Order the numbers from least to greatest.**

Question 25.

Answer:

50,67,76.

Explanation:

The numbers from least to greatest is 50,67,76.

**Complete each number pattern.**

Question 26.

73, 72, 71, __________, _________, 68, ___________

Answer:

73,72,71,70,69,68,67.

Explanation:

The above pattern is 73,72,71,70,69,68,67.

Question 27.

50, 60, __________, 80, __________, __________

Answer:

50,60,70,80,90,100.

Explanation:

The above pattern is 50,60,70,80,90,100.

**Add by counting on.**

Question 28.

82 + 7 = __________

Answer:

82,83,84,85,86,87,88,89.

Explanation:

The sum of 82 and 7 is 82,83,84,85,86,87,88,89.

Question 29.

50 + 40 = __________

Answer:

50+40 = 90.

Explanation:

The sum of 50+40 is 90.

**Add.**

Question 30.

Answer:

76+7= 83.

Explanation:

The addition of 76 and 7 is 83.

Question 31.

Answer:

26+38 = 64.

Explanation:

The addition of 26 and 38 is 64.

**Fill in the missing numbers.**

Question 32.

8 + 33 = _________

Answer:

8+33 = 41.

Explanation:

The addition of 8 and 33 is 41.

Question 33.

64 + 19 = ________

Answer:

64+19 = 83.

Explanation:

The addition of 64 and 19 is 83.

**Count back to subtract.**

Question 34.

97 – 6 = ___________

Answer:

97-6 = 91.

Explanation:

Here, we will count back to find the subtraction of 97 and 6. Which is 97,96,95,94,93,92,91.

Question 35.

50 – 30 = ____________

Answer:

50-30 = 20.

Explanation:

Here, we will count back to find the subtraction of 50-30 which is 20.

**Subtract.**

Question 36.

Answer:

63-7 = 56.

Explanation:

The subtraction of 63 and 7 is 56.

Question 37.

Answer:

90-6 = 84.

Explanation:

The subtraction of 90 – 6 is 84.

**Fill in the missing numbers.**

Question 38.

45 – 6 = _________

Answer:

Explanation:

The subtraction of 45-6 is 39.

Question 39.

73 – 58 = __________

Answer:

73-58 = 15.

Explanation:

The subtraction of 73-58 is 15.

**Problem Solving**

**Solve.**

Question 40.

A number is less than 30 but greater than 10. It has 6 in the ones place. What are the possible numbers?

Answer:

16 and 26.

Explanation:

Given that a number is less than 30 but greater than 10 and it has 6 in the ones place. So the possible numbers is 16 and 26.

Question 41.

A number is 65 when you subtract 6 then add 7. What is the number? Circle the number.

Answer:

64.

Explanation:

Given that a number is 65 when you subtract 6 then add 7. So the possible number is 64. As when we subtract 64-6 we will get 58 and then by adding 7 we will get 65.

Question 42.

Write an addition sentence to make 100. One of the numbers must have 3 in the ones place.

___________ + ___________ = 100

Answer:

**Fill in the blank. Choose a number in the box.**

Question 43.

62 – _________ = 26

Answer:

62-36 = 26.

Explanation:

To find the missing number we will subtract 62-26 which is 36.