All the solutions provided in **McGraw Hill My Math Grade 5 Answer Key PDF Chapter 5 Lesson 1 Round Decimals** will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 5 Answer Key Chapter 5 Lesson 1 Round Decimals

Recall that numbers with digits in the tenths place, hundredths place, or beyond are called decimals. When you round a decimal, you find its approximate value.

**Math in My World**

**Example 1**

Andrew’s laptop has a processor with a speed of 2.8 gigahertz. Round the processing speed of the laptop to the nearest whole number.

Use a number line to round 2.8 to the nearest whole number.

1. Draw 10 equal increments between 2 and 3 on the number line.

Answer:

There are 10 equal increments between 2 and 3 on the number line.

Explanation:

2. Place a dot at 2.8 and label it.

2.8 is closer to ____________.

So, round 2.8 to _____________.

Answer:

3, round 2.8 to 3.

Explanation:

2.8 is closer to 3.

So, round 2.8 to 3.

**Example 2**

Round 46.73 to the nearest tenth.

So, 46.73 rounds to ___________.

Answer:

46.73 rounds to 46.7.

Explanation:

**Talk Math**

Explain how to round 74.685 to the nearest hundredth.

Answer:

74.685 to the nearest hundredth is 74.69.

Explanation:

We need to round 74.685 to the nearest hundredth so consider the thousandth place value of 74.685, which is 5 and equal to or more than 5. Therefore, the hundredth value of 74.685 is 74.69.

**Guided Practice**

Question 1.

Round 8.74 to the nearest one. Underline the digit in the ones place.

8.74

Look at the ___________, the digit to the right of 8.

So, 8.74 rounds to _____________.

Answer:

7, 9

Explanation:

Look at the 7, the digit to the right of 8.

So, 8.74 rounds to 9.

**Independent Practice**

**Round each decimal to the place indicated.**

Question 2.

5.476; hundredths

Answer:

5.5

Explanation:

By rounding off the decimal number to the place indicated is 5.5

Question 3.

983.625; hundredths

Answer:

983.6

Explanation:

By rounding off the decimal number to the place indicated is 983.6.

Question 4.

28.6; ones

Answer:

29

Explanation:

By rounding off the decimal number to the place indicated is 29.

Question 5.

4.35; tenths

Answer:

4

Explanation:

By rounding off the decimal number to the place indicated is 4.

Question 6.

110.079; hundredths

Answer:

110.1

Explanation:

By rounding off the decimal number to the place indicated is 110.1

Question 7.

67.142; ones

Answer:

67

Explanation:

By rounding off the decimal number to the place indicated is 67.

Question 8.

1.8; ones

Answer:

2

Explanation:

By rounding off the decimal number to the place indicated is 2.

Question 9.

7.358; hundredths

Answer:

7.4

Explanation:

By rounding off the decimal number to the place indicated is 7.4.

Question 10.

48.32; ones

Answer:

48

Explanation:

By rounding off the decimal number to the place indicated is 48.

Question 11.

9.045; tenths

Answer:

9.1

Explanation:

By rounding off the decimal number to the place indicated is 9.1.

Question 12.

19.25; ones

Answer:

19

Explanation:

By rounding off the decimal number to the place indicated is 19.

Question 13.

8.17; tenths

Answer:

8

Explanation:

By rounding off the decimal number to the place indicated is 8.

**Problem Solving**

Question 14.

What is the length of the 10-dollar bill to the nearest whole number?

Answer:

16 cm

Explanation:

Given,

The length of the 10-dollar bill.

We have to find the length of the 10-dollar bill to the nearest whole number

Therefore the answer is 16 cm.

Question 15.

The weight of a new touch screen device is 1.6 pounds. What is the weight to the nearest whole number?

Answer:

2 pounds.

Explanation:

Given,

The weight of a new touchscreen device is 1.6 pounds.

The weight to the nearest whole number is 2 pounds.

**HOT Problems**

Question 16.

**Mathematical PRACTICE** Keep Trying Write two different numbers that when rounded to the nearest tenth will give you 18.3.

Answer:

18.26 and 18.27

Explanation:

The two different numbers are 18.26 and 18.27 that round to 18.3.

Question 17.

**Mathematical PRACTICE** Use Number Sense Explain what happens when you round 9999.999 to any place.

Answer:

10,000

Explanation:

The number 9,999.999 becomes 10,000 of what place is being rounded.

Question 18.

**Building on the Essential Question** In what real-world situations would you want to round a number?

Answer:

Rounding the numbers makes calculation simpler and converts the numbers to an approximate value which is very easier to remember and calculate.

### McGraw Hill My Math Grade 5 Chapter 5 Lesson 1 My Homework Answer Key

**Practice**

**Round each decimal to the place indicated.**

Question 1.

5.476; hundredths

Answer:

5.5

Explanation:

By rounding off the decimal number to the place indicated is 5.5.

Question 2.

4.35; tenths

Answer:

4.4

Explanation:

By rounding off the decimal number to the place indicated is 4.4.

Question 3.

1.8; ones

Answer:

By rounding off the decimal number to the place indicated is 1.8.

Question 4.

0.79; ones

Answer:

1

Explanation:

By rounding off the decimal number to the place indicated is 1.

Question 5.

1.049; hundredths

Answer:

1.1

Explanation:

By rounding off the decimal number to the place indicated is 1.1.

Question 6.

17.92; tenths

Answer:

By rounding off the decimal number to the place indicated is 17.92.

**Problem Solving**

**Use the information in the table to solve Exercises 7-9. Round each number to the place indicated.**

Question 7.

What is the area of Florida rounded to the nearest tenth?

Answer:

65,754.6

Explanation:

Given,

Area of Florida = 65,754.59

The area rounded to the nearest tenth is 65,754.6.

Question 8.

What is the area of South Carolina rounded to the nearest tenth?

Answer:

32020.20

Explanation:

Given,

Area of South Carolina = 32,020.20

The area rounded to the nearest tenth is 32,020.2

Question 9.

What is the area of Georgia rounded to the nearest square mile?

Answer:

59425 is the nearest square mile.

Explanation:

Given,

Area of Georgia = 59424.77

The area of Georgia rounded to the nearest square mile is 59425.

Question 10.

The African bush elephant weighs between 4.4 tons and 7.7 tons. What are its least and greatest weights, rounded to the nearest ton?

Answer:

Least = 4 tons

Greatest ton = 8 tons

Explanation:

Given,

The weight of the African bush elephant is 4.4 tons and 7.7 tons.

We need to find its least and greatest weights, rounded to the nearest ton.

The least is 4 tons and 7.7 tons.

Question 11.

**Mathematical PRACTICE** Be Precise The price of a gallon of milk is $3.75. Circle the price of a gallon of milk rounded to the nearest dollar.

$3.70

$3.75

$4.00

$3.80

Answer:

$4.00

Explanation:

Given,

The price of a gallon of milk is $3.75.

The price of a gallon of milk is $4.00 which is rounded to the nearest dollar .

**Test Practice**

Question 12.

Holly bought blank CDs and spent $34.57. What is that amount rounded to the nearest dollar?

(A) $35

(B) $34.60

(C) $34.50

(D) $34

Answer:

$35

Explanation:

Given,

Holly bought blank CDs and spent $34.57

The amount rounded to the nearest dollar is $35.