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3.3 Estimate Sums and Differences

3.3 Estimate Sums and Differences. Objective: To estimate sums and differences of Whole numbers and Decimals. What is an Estimate?. To find a number that is close to an exact amount When your finding an estimate, you are finding about how many .

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3.3 Estimate Sums and Differences

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  1. 3.3 Estimate Sums and Differences Objective: To estimate sums and differences of Whole numbers and Decimals

  2. What is an Estimate? • To find a number that is close to an exact amount • When your finding an estimate, you are finding about how many. • Estimates are used when an exact answer is not necessary.

  3. When is it appropriate to estimate a sum or a difference? • When you do not need an exact answer • When deciding how much money to take to store • When calculating the distance you need to travel or how further you still need to travel • An estimated sum or difference helps you determine if your exact answer is reasonable

  4. About how many more people visited the park in 2000- 2001 than in 1991 – 1992? Use the table.

  5. Estimate by Rounding Round to the nearest Whole Number

  6. Estimate by Rounding Round to the nearest Tenth

  7. Another way to estimate sum or difference is to use front-end estimation Font-end estimation is a method of estimating sums and differences by using the value of the front digits of the numbers.

  8. Front-end estimation

  9. What type of rounding is front-end estimation?

  10. Solve • Reteach Page 12 • Homework: PW page 12 Q1 to 14

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