Rounding and Estimating Differences

In this video, Mr. J teaches how to estimate decimal differences by rounding decimals to the nearest whole number and then subtracting. The video includes four examples demonstrating the process of rounding, subtracting, and comparing the estimated result to the exact answer. The lesson emphasizes the importance of understanding estimation as a way to find approximate values and highlights the use of a squiggly equal sign to denote approximation. Each example illustrates the steps of rounding decimals, performing subtraction, and evaluating the closeness of the estimate to the actual result.

What is the purpose of estimating decimal differences?

• To find the exact answer

• To find an approximate value

• To avoid using decimals

• To make calculations more complex

When rounding 5.7 to the nearest whole number, what do you get?

• 6

• 4

• 5

• 7

What is the estimated difference when rounding 5.7 and 1.3 to the nearest whole numbers?

• 3

• 6

• 5

• 4

What is the nearest whole number to 7.2?

• 8

• 6

• 7

• 5

After rounding, what is the estimated difference between 7.2 and 3.41?

• 3

• 4

• 2

• 5

What whole number does 17.99 round to?

• 17

• 18

• 19

• 16

What is the estimated difference between 17.99 and 4.85 after rounding?

• 11

• 14

• 13

• 12

To what whole number does 10.049 round?

• 8

• 10

• 11

• 9

What is the estimated difference between 10.049 and 2.76 after rounding?

• 7

• 6

• 8

• 5

What is the exact answer for the difference between 10.049 and 2.76?

• 7.200

• 7.289

• 7.000

• 7.100