All the solutions provided in **McGraw Hill Math Grade 3 Answer Key PDF Chapter 1 Lesson 4 Round to the Nearest Ten** will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 3 Answer Key Chapter 1 Lesson 4 Round to the Nearest Ten

When you round, you change the value of a number to one that is easier to work with.

**Math in My World**

Example 1

There are 32 people in line ahead of Cassandra to buy popcorn. About how many people is that? Round to the nearest ten.

Use a place-value chart.

1. Circle the digit to be rounded.

2. Look at the digit to its right.

3. If the digit is less than 5, do not change the circled digit.

2 < 5

4. Replace all the digits after the circled digit with zeros.

Use a number line.

Either method you use, the answer is the same. Cassandra has about ___ people in front of her

Answer:

32 is rounded to the nearest ten is 30.

32 is closer to 30 than 40.

Either method you use, the answer is the same. Cassandra has about 30 people in front of her.

Example 2

Sonja sent 165 text messages on her family’s cell phone. About how many messages did Sonja send?

Use a place-value chart to round 165 to the nearest ten.

1. Circle the digit to be rounded.

2. Look at the digit to its right.

3. If the digit is 5 or greater, add 1 to the circled digit.

5 = 5

4. Replace all the digits after the circled digit with zeros.

So, Sonja sent about 170 text messages.

Answer:

165 rounded to the nearest ten is 170.

Therefore, Sonja sent about 170 text messages.

**Talk Math**

What should you do to round a number that ends in 5, which is exactly halfway between two numbers?

**Guided Practice**

**Round to the nearest ten**

Question 1.

______

Answer:

Given that,

The number is 58.

58 rounded to the nearest ten is 60.

The ones place is greater than 5. So, replace the ones place by 0 and tens place is add with 1.

Question 2.

______

Answer:

The number is 85.

85 rounded to the nearest ten is 90.

The ones place is equal to 5. So, replace the ones place by 0 and tens place is add with 1.

Question 3.

_______

Answer:

The number is 72.

72 rounded to the nearest ten is 70.

The ones place is less than 5. So, replace the ones place by 0.

**Independent Practice**

**Round to the nearest ten.**

Question 4.

77 ____

Answer:

The number is 77.

77 rounded to the nearest ten is 80.

The ones place is greater than 5. So, replace the ones place by 0 and 1 to the tens place.

Question 5.

67 ______

Answer:

The number is 67.

67 rounded to the nearest ten is 70.

The ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

Question 6.

13 ____

Answer:

The number is 13.

13 rounded to the nearest ten is 10.

The ones place is less than 5. So, replace the ones place by 0.

Question 7.

21 ____

Answer:

The number is 21.

21 rounded to the nearest ten is 20.

The ones place is less than 5. So, replace the ones place by 0.

Question 8.

285 ____

Answer:

The number is 285.

285 rounded to the nearest ten is 290.

The ones place is equal to 5. So, replace the ones place by 0 and 1 to the tens place.

Question 9.

195 ____

Answer:

The number is 195.

195 rounded to the nearest ten is 200.

The ones place is equal to 5. So, replace the ones place and tens place by 0 and add 1 to the hundreds place.

Question 10.

157 ____

Answer:

The number is 157.

157 rounded to the nearest ten is 160.

The ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

Question 11.

679 ____

Answer:

The number is 679.

679 rounded to the nearest ten is 680.

The ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

Question 12.

123 ____

Answer:

The number is 123.

123 rounded to the nearest ten is 120.

The ones place is less than 5. So, replace the ones place by 0.

Question 13.

244 ____

Answer:

The number is 244.

144 rounded to the nearest ten is 140.

The ones place is less than 5. So, replace the ones place by 0.

Question 14.

749 ______

Answer:

The number is 749.

749 rounded to the nearest ten is 750.

The ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

Question 15.

603 ____

Answer:

The number is 603.

603 rounded to the nearest ten is 600.

The ones place is less than 5. So, replace the ones place by 0.

Question 16.

353 ____

Answer:

The number is 353.

353 rounded to the nearest ten is 350.

The ones place is less than 5. So, replace the ones place by 0.

Question 17.

894 ____

Answer:

The number is 894.

894 rounded to the nearest ten is 890.

The ones place is less than 5. So, replace the ones place by 0.

Question 18.

568 ____

Answer:

The number is 568.

568 rounded to the nearest ten is 570.

The ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

Question 19.

829 ____

Answer:

The number is 829.

829 rounded to the nearest ten is 830.

The ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

**Round each number to the nearest ten. Circle the row or column in which three rounded numbers are the same.**

Question 20.

Answer:

In the given numbers 251, 249, 245 rounded to the nearest is 250.

Therefore 251, 249, 245 are rounded to the same number.

Question 21.

Answer:

In the given numbers 486, 492, 493 rounded to the nearest ten is 490.

Therefore 486, 492, 493 rounded to the same number.

**Round to the nearest ten. Draw a line to match each number to its rounded number.**

Answer:

**Problem Solving**

**Mathematical PRACTICE 4 Model Math** The table shows Dan’s bowling scores for one week.

Question 27.

To the nearest ten, on which day was the score about 260?

Answer:

Given that the score is about 260.

The Thursday score is 256.

The 256 is rounded to the nearest ten is 260

Question 28.

To the nearest ten, what was Tuesday’s score?

Answer:

Given that,

The Tuesdays score is 83.

83 rounded to the nearest ten is 80.

In 83 the ones place is less than 5. So, replace the ones place by 0.

Question 29.

To the nearest ten, which day’s score rounds to 250?

Answer:

Given that,

The rounded number is 250.

The Monday score is 252.

252 rounded to the nearest ten is 250.

In 252 the ones place is less than 5. So, replace the ones place by 0.

**HOT Problems**

Question 30.

**Mathematical PRACTICE 8 Look for a Pattern** Josie is thinking of a number that when rounded to the nearest ten is 100. What could the number be? Explain.

Answer:

The numbers 95, 96, 97, 98, 99 are rounded to the nearest ten is 100.

Question 31.

**Mathematical PRACTICE 3 Find the Error** Thomas rounded the numbers below to the nearest ten. Circle his error. Explain.

184 → 180 55 → 50 344 → 340

Answer:

Given that,

184 rounded to 180.

55 rounded to 50.

344 rounded to 340.

Here error is 55 rounded to 50.

The correct answer is 55 rounded to the nearest ten is 60.

Question 32.

**? Building on the Essential Question** Why are rounded numbers easier to work with?

Answer:

The rounded numbers are easier to work because rounding involves making a number simpler by changing it to the closest value.

### McGraw Hill My Math Grade 3 Chapter 1 Lesson 4 My Homework Answer Key

**Practice**

**Round to the nearest ten.**

Question 1.

392 ____

Answer:

Given that,

The number is 392.

392 rounded to the nearest ten is 390.

In 392 the ones place is less than 5. so, replace the ones place by 0.

Question 2.

126 ____

Answer:

Given that,

The number is 126.

126 rounded to the nearest ten is 130.

In 392 the ones place is greater than 5. so, replace the ones place by 0 and add 1 to the tens place.

**Use the number line to round to the nearest ten.**

Question 3.

753

______

Answer:

Given that,

The number is 753.

753 rounded to the nearest ten is 750.

In 753 the ones place is less than 5. so, replace the ones place by 0.

753 is closer to 750 than 760.

Question 4.

758

______

Answer:

Given that,

The number is 758.

758 rounded to the nearest ten is 760.

In 758 the ones place is greater than 5. so, replace the ones place by 0 and 1 to the tens place.

758 is closer to 760 than 750.

Question 5.

756

______

Answer:

Given that,

The number is 756.

756 rounded to the nearest ten is 760.

In 756 the ones place is greater than 5. so, replace the ones place by 0.

756 is closer to 760 than 750.

**Use the number line to round to the nearest ten.**

Question 6.

302 ______

Answer:

Given that,

The number is 302.

302 rounded to the nearest ten is 300.

In 302 ones place is less than 5. So, replace the ones place by 0.

302 is closer to 300.

Question 7.

304 ______

Answer:

Given that,

The number is 304.

304 rounded to the nearest ten is 300.

In 304 ones place is less than 5. So, replace the ones place by 0.

304 is closer to 300.

Question 8.

305 ____

Answer:

The number is 305.

305 rounded to the nearest ten is 310.

In 305 ones place is equal to 5. So, replace the ones place by 0 and 1 to the tens place.

305 is closer to 310.

**Round to the nearest ten.**

Question 9.

429 ____

Answer:

Given that,

The number is 429.

429 rounded to the nearest ten is 430.

In 429 ones place is greater than 5. So, replace the ones place by 0 and add 1 to the tens place.

Question 10.

191 ______

Answer:

Given that,

The number is 191.

191 rounded to the nearest ten is 190.

In 191 ones place is less than 5. So, replace the ones place by 0.

Question 11.

198 ____

Answer:

Given that,

The number is 198.

198 rounded to the nearest ten is 200.

In 198 ones place is greater than 5. So, replace the ones and tens place by 0 and add 1 to the hundreds place.

**Problem Solving**

Question 12.

**Mathematical PRACTICE 2 Use Number Sense** Garret’s dog weighs 127 pounds. About how much does his dog weigh to the nearest ten pounds?

Answer:

Given that,

Garret’s dog weighs 127 pounds.

127 rounded to the nearest ten is 130.

In 127 the ones place is greater than 5. So, replace the ones place by 0 and 1 to the tens place.

**Vocabulary Check**

**For each sentence, write one of the following on the line.**

round nearest ten

Question 13.

To _____ a number, you change its value to a number that is easier to work with.

Answer:

To round a number, you change its value to a number that is easier to work with.

**Test Practice**

Question 15.

Faith has added 143 songs to her music library on her computer About how many songs is that? Round to the nearest ten.

A. 130 songs

B. 140 songs

C. 145 songs

D. 150 songs

Answer:

Given that,

Faith has added 143 songs to her music library on her computer.

143 rounded to the nearest ten is 140.

In 143 the ones place is less than 5. So, replace ones place by 0.

143 is closer to 140 than 150.

Option B is the correct answer.