# Unit: Estimation

Tara Smith E.l. Haynes Pcs Washington, DC
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### Unit Description

This unit includes the explicit teaching of three strategies for estimation: rounding, front-end rounding, and regrouping. It also includes estimating techniques and computations for three digits and values to \$1,000. Finally, the unit closes with students judging the reasonableness of their answers. Standards covered: 4.NSO-E.28. Estimate and compute the sum or difference of whole numbers and positive decimals to two places; 4.NSO-E.29. Estimate the answers to calculations involving addition, subtraction, or multiplication; know when approximation or a rounded solution is appropriate and use it to check the reasonableness of answers.; 4.NSO-E.30. Select and use a variety of strategies (e.g., front-end, rounding, and regrouping) to estimate quantities, measures, and the results of whole-number computations up to three-digit whole numbers and amounts of money to \$1,000 and to judge the reasonableness of answers.

### Lessons

 Intro to Estimation Resources: 5 SWBAT define seven core vocabulary words associated with estimation 2,774 Rounding: Hundred Thousands Place Resources: 1 SWBAT round whole number to the hundred thousand 1,699 Rounding: Hundred Millions Place Resources: 2 SWBAT round whole numbers up to the hundred millions. 2,614 Front End Rounding: Sum with Decimals Resources: 1 SWBAT use front end rounding to estimate the sum of whole numbers and positive decimals to two places. 3,118 Front End Rounding: Difference with Decimals Resources: 1 SWBAT use front end rounding to estimate the difference of whole numbers and two positive decimals. 6,112 Regrouping to Estimate: Sum or Difference Resources: 2 SWBAT use regrouping to round whole numbers up to the ten thousand to compute the sum. 2,363 Estimation Techniques: + / - Computations of 3 Digit Numbers Resources: 2 SWBAT use estimation techniques to solve whole number computations (addition /subtraction) up to 3 digit numbers. 2,453 Estimation Techniques: Computations \$1,000 Resources: 2 SWBAT use estimation techniques to solve whole number computations of amounts no greater than \$1,000 656 Estimation Techniques: x­ Computations of 3 Digit Numbers Resources: 2 SWBAT use estimation techniques to solve whole number computations (multiplication) up to 3 digit numbers 766 Reasonableness of Answer Resources: 2 SWBAT judge the reasonableness of an answer by using estimation. 2,062 Approximation to Solve Whole Number Computations Resources: 2 SWBAT select the exact answer or the approximation to solve whole number computations. 1,047

### Unit Resources

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