Estimating Division and Rounding

This video tutorial provides practice in estimating division with decimals. It explains how to approximate division problems by rounding numbers to make mental calculations easier. Three examples are given: estimating 80 divided by 1.94 by rounding to 80 divided by 2, estimating 209 divided by 3 by recognizing it as close to 210 divided by 3, and estimating 6.86 divided by 1.12 by rounding to 7 divided by 1. The video emphasizes that these are estimations, not exact calculations.

What does the squiggly equal sign represent in mathematical estimations?

• Greater than

• Less than

• Approximately equal

• Exactly equal

Tags

CCSS.5.NBT.B.7

When estimating 80 divided by 1.94, which number is 1.94 rounded to for easier calculation?

• 2

• 4

• 1

• 3

What is the approximate result of 80 divided by 2?

• 50

• 40

• 30

• 20

Tags

CCSS.4.NBT.B.6

In the second example, which number is 209 rounded to for easier division by 3?

• 230

• 220

• 210

• 200

Tags

CCSS.4.NBT.B.6

What is the result of dividing 210 by 3?

• 60

• 75

• 70

• 65

Tags

CCSS.5.NBT.B.7

When estimating 6.86 divided by 1.12, to which whole number is 6.86 rounded?

• 8

• 7

• 6

• 5

Tags

CCSS.5.NBT.B.7

To which whole number is 1.12 rounded when estimating 6.86 divided by 1.12?

• 2

• 0

• 3

• 1

What is the approximate result of 7 divided by 1?

• 7

• 8

• 5

• 6

Why is it important to understand that these calculations are estimations?

• They provide exact answers

• They simplify complex calculations

• They are always incorrect

• They are only used in advanced mathematics

Which of the following is NOT a reason to use estimation in division?

• To avoid using a calculator

• To find the exact answer

• To simplify mental calculations

• To get a rough idea of the result