Front End & Rounding Gwendolyn Best Suffolk Public Schools.

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Presentation transcript:

Front End & Rounding Gwendolyn Best Suffolk Public Schools

Estimation The next few slides will help you test your estimation skills.

Can I buy three for $100? 45

Can I buy three for $100? $23

Can I buy 5 for $50? The basketball would have to cost ______ or less for me to purchase five of them for $50.

Can I buy three for $20? $ 4.95

Rounding to the highest Place Value Round each number to its highest possible place value. Some numbers will be rounded to ten- thousands, thousands, hundreds, or tens.

, Hundreds 26Tens 1,427Thousands 216Hundreds

Round to the highest place. 375Hundreds400 26Tens30 1,427Thousands1, Hundreds200

After you round, add the numbers!

Between 11,000 and 15,000 Between 16,000 and 20,000 Between 20,000 and 25,000 Between 28,000 and 33,

A little less than 7,000 A little less than 8,000 A little more than 8,000 A little more than 10,000

Front End Estimation

FRONT END The name of this strategy gives you a clue about how it is used. The word FRONT should remind you that you are only concerned with the front portion of the number. Many people think this strategy is easier than rounding to the highest place value.

4, , , , Draw a line through your list of numbers so that you have at least one digit from each addend in front of (before) the line. Change all numbers after the line to zeros. All numbers before the line stay the same.

, ,427 1,

Draw the line after the first number In each addend.

Between 11,000 and 15,000 Between 16,000 and 20,000 Between 20,000 and 25,000 Between 28,000 and 33,

Estimate to find the best answer A little more than 7,000 A little more than 8,000 A little less than 9,000 A little less than 10,

Estimate and choose the most reasonable answer. Between 11,000 and 15,000 Between 16,000 and 20,000 Between 20,000 and 25,000 Between 28,000 and 33,

3,876 5,814 3, ,895 4,000 6,000 3, ,000 3,000 5,000 3, ,000

9,876 8,514 6, ,895 9,000 8,000 6, ,000 10,000 9,000 6, ,000