Rounding Numbers and Midpoints

The video tutorial explains how to round numbers to the nearest ten using a vertical number line. It starts with rounding 28 minutes to 30 by identifying the tens place and finding the midpoint. The process is repeated for 117 milliliters, rounding it to 120. The tutorial emphasizes understanding place values and using number lines for rounding.

What is the first step in rounding a number to the nearest ten?

• Subtract ten from the number.

• Add ten to the number.

• Identify the tens place in the number.

• Find the midpoint between two numbers.

When rounding 28 to the nearest ten, what are the two numbers you consider?

• 30 and 40

• 20 and 30

• 40 and 50

• 10 and 20

What is the midpoint between 20 and 30?

• 22

• 24

• 25

• 27

If a number is more than the midpoint, to which number do you round?

• The higher number

• The original number

• The midpoint

• The lower number

What place values are present in the number 117?

• Ones, tens, hundreds

• Tens, hundreds, thousands

• Ones, tens, thousands

• Hundreds, thousands, ten-thousands

How many tens are there in the hundreds place of 117?

• 10

• 100

• 1

• 11

What is the bottom mark on the number line when rounding 117?

• 120

• 111

• 100

• 110

What is the midpoint between 110 and 120?

• 112

• 113

• 114

• 115

If 117 is greater than the midpoint, to which number do you round?

• 125

• 115

• 110

• 120

How many minutes are left until Christine arrives after rounding?

• 25 minutes

• 30 minutes

• 20 minutes

• 35 minutes