This handy Math in Focus Grade 2 Workbook Answer Key Cumulative Review for Chapters 15 to 17 detailed solutions for the textbook questions.

## Math in Focus Grade 2 Cumulative Review for Chapters 15 to 17 Answer Key

**Concepts and Skills**

**Skip-count.**

Question 1.

3, 6, 9, ________, ________, ________, ________, ________, ________, ________

Answer:

3, 6, 9, 12, 15, 18, 21, 24, 27, 30.

Explanation:

I wrote the next seven numbers

I skip counted by 3 and wrote the numbers.

The numbers have difference of 3 between each consecutive pair.

Question 2.

4, 8, 12, ________, ________, ________, ________, ________, ________, ________

Answer:

4, 8, 12, 16, 20, 24, 28, 32, 36, 40.

Explanation:

I wrote the next seven numbers

I skip counted by 4 and wrote the numbers.

The numbers have difference of 4 between each consecutive pair.

**Fill in the blanks.**

Question 3.

4 groups of 3 = ________ × _______ = _______

Answer:

4 x 3 = 12

Explanation:

The product of 4 and 3 is 12

So, 4 x 3 that is 4 groups of 3 is 12.

Question 4.

8 groups of 3 = ________ × _______ = _______

Answer:

8 x 3 = 24

Explanation:

The product of 8 and 3 is 24

So, 8 x 3 that is 8 groups of 3 is 24.

Question 5.

3 groups of 4 = ________ × _______ = _______

Answer:

3 x 4 = 12

Explanation:

The product of 3 and 4 is 12

So, 3 x 4 that is 3 groups of 4 is 12.

Question 6.

9 groups of 4 = ________ × _______ = _______

Answer:

9 x 4 = 36

Explanation:

The product of 9 and 4 is 36

So, 9 x 4 that is 9 groups of 4 is 36.

**Use dot paper to find the missing numbers.**

Question 7.

Answer:

Explanation:

I wrote the missing numbers in the equations using dot papers

There are 6 rows and 3 columns that is 6 groups of 3 dots

So, 6 x 3 = 18

In the second dot paper

There are 3 rows and 6 columns that is 3 groups of 6 dots

3 x 6 = 18.

Question 8.

Answer:

Explanation:

I wrote the missing numbers in the equations using dot papers

There are 5 rows and 4 columns that is 5 groups of 4 dots

So, 5 x 4 = 20

In the second dot paper

There are 4 rows and 5 columns that is 4 groups of 5 dots

4 x 5 = 20.

**Complete the multiplication sentences. Use dot paper to help you.**

Question 9.

9 × 3 = __________

3 × 9 = __________

Answer:

Explanation:

I completed the multiplication sentences using dot papers

So, 9 x 3 = 27 and 3 x 9 = 27.

Question 10.

7 × 3 = __________

3 × 7 = __________

Answer:

Explanation:

I completed the multiplication sentences using dot papers

So, 7 x 3 = 21 and 3 x 7 = 21.

Question 11.

10 × 4 = _________

4 × 10 = _________

Answer:

Explanation:

I completed the multiplication sentences using dot papers

So, 10 x 4 = 40 and 4 x 10 = 40.

Question 12.

6 × 4 = __________

4 × 6 = __________

Answer:

Explanation:

I completed the multiplication sentences using dot papers

So, 6 x 4 = 24 and 4 x 6 = 24.

**Fill in the blan****ks.**

Question 13.

10 × 4 = __________

7 × 4 = 10 groups of 4 – 3 groups of 4

= _________ – 12

= _________

Answer:

10 x 4 = 40

7 x 4 = 28

Explanation:

10 × 4 = __________

7 × 4 = 10 groups of 4 – 3 groups of 4

= 40 – 12

= 28

So, 7 x 4 = 28.

Question 14.

5 × 3 = __________ 7 × 3 = 5 groups of 3 + 2 groups of 3

= ________ + 6

= _________

Answer:

5 x 3 = 15

7 x 3 = 21

Explanation:

7 × 3

= 5 groups of 3 + 2 groups of 3

= 15 + 6

= 21

So, 7 x 3 = 21.

**Complete the multiplication and division sentences.**

Question 15.

________ × 3 = 15

15 ÷ 3 = __________

Answer:

5 x 3 = 15

15 ÷ 3 = 5

Explanation:

5 groups of 3 is 15

If 15 is divided into 3 groups then each group will have 5

So, 15 ÷ 3 = 5.

Question 16.

________ × 4 = 20

20 ÷ 4 = __________

Answer:

5 x 4 = 20

20 ÷ 4 = 5

Explanation:

5 groups of 4 is 20

If 20 is divided into 4 groups then each group will have 5

So, 20 ÷ 4 = 5.

**Fill in the blanks. Use the picture graphs to help you.**

A large bottle contains different kinds of nuts. The graph shows the number of each kind of nut in the Jar.

Question 17.

There are __________ peanuts in the jar.

Answer:

20 peanuts

Explanation:

There are 10 for peanuts

Each stands for 2 nuts

10 x 2 = 20

So, there are 20 peanuts in the jar.

Question 18.

The number of __________ and _________ in the jar is the same.

Answer:

Cashew and Pecan

Explanation:

Each stands for 2 nuts

There are 4 for cashew and 4 for pecans

4 x 2 = 8

So, The number of Cashew and Pecans in the jar is the same that is 8.

Question 19.

There are __________ fewer walnuts than almonds.

Answer:

6 fewer walnuts

Explanation:

Each stands for 2 nuts

There are 6 for Almonds

There are 3 for Walnuts

6 x 2 = 12

3 x 2 = 6

12 – 6 = 6

So, there are 6 fewer walnuts than almonds in the jar.

Question 20

There are __________ more peanuts than cashews.

Answer:

12 more peanuts

Explanation:

Each stands for 2 nuts

There are 4 for cashew and 10 for peanuts

4 x 2 = 8

10 x 2 = 20

20 – 8 = 12

So, there are 12 more peanuts than cashews in the jar.

Question 21.

There are ____________ almonds and pecans in all.

Answer:

20 almonds and pecans

Explanation:

Each stands for 2 nuts

There are 6 for almonds and 4 for pecans

6 x 2 = 12

4 x 2 = 8

12 + 8 = 20

So, there are 20 almonds and pecans in all in the jar.

**Count the vegetables in a bin. Then complete the tally chart.**

Answer:

Explanation:

I counted the number of each kind of vegetables and drew tally marks for the numbers.

Question 22.

Use the picture and the tally chart to make a bar graph.

Answer:

Explanation:

I used the tally marks to fill the bar graph

I counted and filled the number of each kind of vegetable in the graph.

**Complete. Use your bar graph to help you.**

Question 23.

How many carrots are there?

Answer:

10

Explanation:

There are 10 carrots.

Question 24.

How many tomatoes are there?

Answer:

16

Explanation:

There are 16 tomatoes.

Question 25.

How many cabbages are there?

Answer:

6

Explanation:

There are 6 cabbages.

**Problem Solving**

**Solve. Draw bar models to help you.**

Question 26.

Alicia has 3 bags. She puts 10 beads in each bag. How many beads does she have?

There are _________ beads in all.

Answer:

Explanation:

Alicia has 3 bags

She puts 10 beads in each bag

10 x 3 = 30 or

10 + 10 + 10 = 30

There are 30 beads in all.

**Solve. Draw bar models to help you.**

Question 27.

Peter has 18 crayons. He divides them into 3 equal groups. How many crayons are in each group?

There are ___________ crayons in each group.

Answer:

Explanation:

Peter has 18 crayons

He divides them into 3 equal groups

18 ÷ 3 = 6

So, there are 6 crayons in each group.

Question 28.

Yasmin buys 30 stickers. She distributes the stickers equally among her 5 friends. How many stickers does each of her friends get?

Each friend gets _____________stickers.

Answer:

Explanation:

Yasmin buys 30 stickers

She distributes the stickers equally among her 5 friends

6 + 6 + 6 + 6 + 6 = 30

Each friend gets 6 stickers.

Question 29.

A day camp has 12 soccer balls. Each team uses 3 balls. How many teams are there?

There are __________ teams.

Answer:

Explanation:

A day camp has 12 soccer balls

Each team uses 3 balls

12 ÷ 3 = 4

There are 4 teams.

Question 30.

5 bags of food for a food drive have a mass of 25 kilograms. Each bag has the same mass. What is the mass of each bag?

The mass of each bag is ___________ kilograms.

Answer:

Explanation:

5 bags of food for a food drive have a mass of 25 kilograms

25 ÷ 5 = 5

The mass of each bag is 5 kilograms.

Question 31.

The total length of a piece of lace is 28 feet. It is cut into equal pieces 4 feet long. How many pieces are there?

There are __________ pieces.

Answer:

Explanation:

The total length of a piece of lace is 28 feet

It is cut into equal pieces 4 feet long

24 ÷ 4 = 7 or

4 + 4 + 4 + 4 + 4 + 4 + 4 = 28 7 groups

There are 7 pieces.

Question 32.

Andrew uses 6 liters of water to water his plants every day. How many liters of water does he use in 4 days?

He uses ________ liters of water.

Answer:

Explanation:

Andrew uses 6 liters of water to water his plants every day

water for 4 days is 6 x 4 = 24 or

6 + 6+ 6 + 6 = 24

He uses 24 liters of water.

**Complete the picture graph using Exercises 33 and 34. Then use the graph to solve Exercises 35 and 36.**

A group of people attended a workshop. They were divided into 5 groups. The number of people in each group is shown in the graph.

Question 33.

There were 15 people in Group 2. What does each stand for?

Answer:

Each stand for 5 people.

Question 34.

Draw to show 20 people in Group 5.

Answer:

Explanation:

Each stands for 5 people

I need to represent 20 people in Group 5

So, i drew 4

4 x 5 20.

Question 35.

7 people in Group 3 were women. How many were men?

Answer:

23 were men

Explanation:

There are 6 in group 3

Each stands for 5 people

6 x 5 = 30

7 people in Group 3 were women

30 – 7 = 23

So, 23 people in group 3 were men.

Question 36.

There were 50 men in Group 1 and Group 4. How many women were there in Group 1 and Group 4?

Answer:

10 women

Explanation:

Each stands for 5 people

There are 7 in Group 1

There are 5 in Group 4

7 x 5 = 35

5 x 5 = 25

35 + 25 = 60

There were 50 men in Group 1 and Group 4

Subtract 50 from 60

60 – 50 = 10

So, 10 women were there in Group 1 and Group 4.