All the solutions provided in **McGraw Hill Math Grade 5 Answer Key PDF Chapter 2 Lesson 9 Multiply by One-Digit Numbers** will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 5 Answer Key Chapter 2 Lesson 9 Multiply by One-Digit Numbers

**Math in my World**

Example 1

Grace and her three friends each paid $38 for an admission ticket to an amusement park. The total paid can be found by multiplying 4 and 38.

Find 38 × 4.

So, the total amount paid for admission to an amusement park is ____

Answer:

152

Explanation:

Check you can use an area model to check your answer.

Example 2.

Find 317 × 5.

1585

Estimate 300 × 5 = ____

1500

So, 317 × 5 = ___

Check Compare to the estimate. ____ ≈ ____

1500 ≈ 1585

Answer:

**Guided Practice**

Question 1.

Multiply 42 × 2.

Estimate 40 × 2 = _____

So, 42 × 2 = ____

Check

____ ≈ _____

Answer:

84, 80

84 > 80

Explanation:

**Talk Math**

Describe each step for finding 416 × 3.

Answer:

416 × 3 =

Explanation:

**Independent Practice**

**Estimate. Then multiply. Use your estimate to check your answer.**

Question 2.

Answer:

63

Explanation:

Given multiplicand is 21 and the multiplier is 3^{ }

By multiplying both multiplicand 21 and multiplier 3, we get the value as 63.

Question 3.

Answer:

192

Explanation:

Given multiplicand is 32 and the multiplier is 6.

By multiplying both multiplicand 32 and multiplier 6, we get the value as 192.

Question 4.

Answer:

468

Explanation:

Given multiplicand is 52 and the multiplier is 9.

By multiplying both multiplicand 52 and multiplier 9, we get the value as 468.

Question 5.

Answer:

2807

Explanation:

Given multiplicand is 401 and the multiplier is 7.

By multiplying both multiplicand 401 and multiplier 7, we get the value as 2807.

Question 6.

Answer:

2136.

Explanation:

Given multiplicand is 712 and the multiplier is 3.

By multiplying both multiplicand 712 and multiplier 3, we get the value as 2136.

Question 7.

Answer:

1287

Explanation:

Given multiplicand is 143 and the multiplier is 9.

By multiplying both multiplicand 143 and multiplier 9, we get the value as 1287.

Question 8.

31 × 5 = ____

Answer:

155

Explanation:

Given multiplicand is 31 and the multiplier is 5.

1 × 5 = 5

3 × 5 = 15

By multiplying both multiplicand 31 and multiplier 5, we get the value 155.

The multiplication of the given number 31 × 5 is 155.

Question 9.

208 × 3 = ____

Answer:

624

Explanation:

Given multiplicand is 208 and the multiplier is 3.

By multiplying both multiplicand 208 and multiplier 3, we get the value as 624.

The multiplication of the given number 208 × 3 is 624.

Question 10.

47 × 6 = ____

Answer:

282

Explanation:

Given multiplicand is 47 and the multiplier is 6.

By multiplying both multiplicand 47 and multiplier 6, we get the value as 282.

The multiplication of the given number 47 × 6 is 282.

Question 11.

211 × 7 = ____

Answer:

1477

Explanation:

Given multiplicand is 211 and the multiplier is 7.

By multiplying both multiplicand 211 and multiplier 7, we get the value as 1477.

The multiplication of the given number 211 × 7 is 1477.

Question 12.

182 × 6 = ____

Answer:

1092

Explanation:

Given multiplicand is 182 and the multiplier is 6.

By multiplying both multiplicand 182 and multiplier 6, we get the value as 1092.

The multiplication of the given number 182 × 6 is 1092.

Question 13.

806 × 7 = ____

Answer:

5642

Explanation:

Given multiplicand is 806 and the multiplier is 7.

By multiplying both multiplicand 806 and multiplier 7, we get the value as 5642

The multiplication of the given number 806 × 7 is 5642.

**Problem Solving**

Question 14.

One 747-airplane can carry 420 passengers. How many total passengers can three planes carry?

Answer:

1260

Explanation:

420 × 3 = 1260

one airplane = 420

Three = 420 × 3

1260

Question 15.

**Mathematical PRACTICE 5 Use Math Tools** In an auditorium, there are 9 rows of seats with 18 seats in each row. There are also 6 rows of seats with 24 seats in each row. How many seats are there in the auditorium? Estimate first. Then check for reasonableness.

Answer:

306

Explanation:

Given,

there are 9 rows of seats with 18 seats in each row = 9 × 18 = 162

There are also 6 rows of seats with 24 seats in each row = 24 × 6 = 144

162 + 144 = 306

Question 16.

Malia bought 14 cans of cat food. Each can weighs 8 ounces. How many total ounces of cat food did she buy?

Answer:

112 oz

Explanation:

Malia bought 14 cans of cat food.

Each can weighs 8 ounces

14 × 8 = 112 oz6

**Hot Problems**

Question 17.

**Mathematical PRACTICE 2** Use Number Sense Catalina multiplied 842 and 3 and got 3,326. How can she check to see if her answer is reasonable?

Answer:

3326 ÷ 3 = 842. The answer is not reasonable.

Explanation:

If we divide the number 3326 by 3 the answer is 1108.22. Hence the answer is not reasonable.

Question 18.

**? Building on the Essential Question** What is the procedure for multiplying by a one-digit number?

Answer:

Step 1: Line the numbers up by place value.

Step 2: Multiply the bottom number by each digit of the top number.

Step 3: Start with the ones.

Step 4: Next, multiply the tens.

### McGraw Hill My Math Grade 5 Chapter 2 Lesson 9 My Homework Answer Key

**Practice**

**Estimate. Then multiply. Use your estimate to check your answer.**

Question 1.

Answer:

144

Explanation:

Given multiplicand is 18 and the multiplier is 8.

By multiplying both multiplicand 18 and multiplier 8, we get the value as 144.

Question 2.

Answer:

288

Explanation:

Given multiplicand is 72 and the multiplier is 4.

By multiplying both multiplicand 72 and multiplier 4, we get the value as 288.

Question 3.

Answer:

1364

Explanation:

Given multiplicand is 341 and the multiplier is 4.

By multiplying both multiplicand 341 and multiplier 4, we get the value as 1364.

**Problem Solving**

Question 4.

**Mathematical PRACTICE 3 Check for Reasonableness** Malcolm ran the 440-yard dash and the 220-yard dash at a track meet. There are 3 feet in one yard. How many total feet did Malcolm run? Estimate first. Then check for reasonableness.

Answer:

1980 feet. The answer is reasonable.

Explanation:

440 + 220 = 660 yard

660 × 3 = 1980 feet.

Question 5.

Each student in Mrs. Henderson’s science class brought in 3 books for the book donation. If there are 25 students in the class, how many total books did they collect?

Answer:

75

Explanation:

From the given question

find 25 × 3

75

The total books they collected are 75.

Question 6.

Karen and Anthony are setting up rows for the piano recital. They set up 24 rows with 6 chairs in each row. How many total people will the rows seat?

Answer:

144

Explanation:

From the given question

Find 24 × 6

144

The total number of people in the rows of seats is 144.

Question 7.

Veronica brought her turtle out of its aquarium for 15 minutes every night for 7 days. How many total minutes did she bring her turtle out of its aquarium?

Answer:

105

Explanation:

From the given question

find 15 × 7

105

The total minutes she brought her turtle out of its aquarium is 105.

**Test Practice**

Question 8.

A restaurant has 36 tables. If each table can sit five people, how many people can be seated at the restaurant?

A. 216 people

B. 180 people

C. 150 people

D. 41 people

Answer:

180 people.

Explanation:

Given,

A restaurant has 36 tables.

If each table can sit five people

36 × 5 = 180

There are 180 people who can be seated at the restaurant.