All the solutions provided in **McGraw Hill My Math Grade 2 Answer Key PDF Chapter 9 Review **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Chapter 9 Review Answer Key

**Vocabulary Check**

data

survey

tally marks

picture graph

line plot

bar graph

**Write the correct word in each blank.**

Question 1.

You can collect data by asking people the same question in a ________________.

Answer: survey

Explanation:

You can collect data by asking people the same question in a survey.

Question 2.

A ________________ uses bars to show data.

Answer: bar graph

Explanation:

A graph that uses bars to show data is Bar graph

Question 3.

Numbers or symbols that show information are called ______________.

Answer: data

Explanation:

Numbers or symbols that show information is Data

Question 4.

A ______________ shows how often a certain number occurs in data.

Answer: Line plot

Explanation:

A graph used to show how often a certain number occurs in data is Line plot

Question 5.

A _______________ uses pictures to show information collected.

Answer: picture graph

Explanation:

A graph that has different pictures to show information collected is Picture graph

Question 6.

A _________________ is a mark used to record data collected in a survey.

Answer: tally marks

Explanation:

Marks used in a survey to collect data is Tally marks.

**Concept Check**

**Use the tally chart to make a picture graph.**

Question 7.

Answer: The detailed votes are given below.

Explanation:

Base ball got 4 votes

Football got 4 votes

Hockey got 2 votes

Volleyball got 3 votes.

**Use the picture graph above to complete the sentences.**

Question 8.

How many students were surveyed?

Answer: 13 students got surveyed

Explanation:

Base ball got 4 votes

Football got 4 votes

Hockey got 2 votes

Volleyball got 3 votes.

So, 13 students got surveyed

Question 9.

How many students like hockey and football?

Answer: 5 students like hockey and football

Explanation:

Base ball got 4 votes

Football got 4 votes

Hockey got 2 votes

Volleyball got 3 votes.

So, 5 students like hockey and football.

**Use the tally chart to make a bar graph.**

Question 10.

Answer: The bar graph below shows the votes

Explanation:

Yes got 10 votes

No got 1 votes

**Use the bar graph above to complete the sentences.**

Question 11.

How many students have been to the zoo?

Answer: 11 students have been to the zoo

Explanation:

From the bar graph above,

Yes got 10 votes

No got 1 votes

So, 11 students have been to the zoo

Question 12.

How many more students have been to the zoo than have not been to the zoo?

Answer: 10 more students have been to the zoo than have not been to the zoo

Explanation:

From the bar graph above,

Yes got 10 votes

No got 1 votes

So, 10 more students have been to the zoo than have not been to the zoo

**Problem Solving**

Question 13.

Taylor asked 12 friends to name their favorite number. Five friends said 4. Six friends said I. One friend said 2. Use Taylor’s data to complete the line plot.

Answer: The complete line plot is given below.

Explanation:

Given, Taylor asked 12 friends to name their favorite number.

Five friends said 4. Six friends said I. One friend said 2.

Question 14.

A tricycle has 3 wheels. How many wheels are there on 4 tricycles?

_____________ wheels

Answer: 12 wheels are there on 4 tricycles

Explanation:

Given,

A tricycle has 3 wheels.

For 4 tricycles , 3 × 4 = 12

So, 12 wheels are there on 4 tricycles

**Test Practice**

Question 15.

There are 4 giraffes at the zoo. Each giraffe has 4 legs. How many legs are there in all?

(A) 2

(B) 4

(C) 8

(D) 16

Answer: D

Explanation:

Given, There are 4 giraffes at the zoo.

Each giraffe has 4 legs.

4 × 4 = 16

So, There are 16 legs in all.

**Reflect**

**Show how to record and analyze data.**

Complete the tally chart.

Answer:

Explanation:

Banana got 5 votes

Apple got 4 votes

Orange got 3 votes.

Use the tally chart to make a picture graph.

Answer:

Explanation:

Banana got 5 votes

Apple got 4 votes

Orange got 3 votes.

Use the tally chart to make a bar graph.

Answer:

Explanation:

Banana got 5 votes

Apple got 4 votes

Orange got 3 votes.

Analyze the data.

How many people like apples and bananas?

Answer: 9 people like apples and bananas

Explanation:

Banana got 5 votes

Apple got 4 votes

Orange got 3 votes.

So, 9 people like apples and bananas.