Estimating Numbers

Estimating Differences: Rounding to Thousands

Estimating Differences:

When estimating to the nearest thousands the first step is to round to the nearest thousands.

• Rounding to the nearest thousands you first look at the number in the thousands column and circle the number.

• Round it up!!!

• eg. Estimating numbers to the nearest thousands
  4,523
  -2,389

Estimating Differences:

• Then look at the number in the hundreds column. The number in the hundreds column will tell us what to do.

• If the number is between 0-4 we stay the same, if its between 5-9 we go up once.

• The number in the thousand’s column will either go up once or stay the same.

• What happens to the digit to the right of the hundreds place? It becomes a zero.

Estimating Differences:

4,523 5,ooo
-2,389 2,000

• 3,000

Estimating Differences:

• Now we SUBTRACT.

• eg. Estimating numbers to the nearest thousands

4,523 5,000
-2,389 -2,000

3,000

Let's repeat the steps....

• Round to the nearest thousands.

• Estimate differences after rounding.

Multiple Choice

899

-110

• 900

• 600

• 800

• 890

Multiple Choice

2,907

-1,097

• 2,000

• 4,000

• 4,004

• 1,000