Unit: Estimation

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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

13
Rounding: Hundred Thousands Place Resources: 1

SWBAT round whole number to the hundred thousand

8
Rounding: Hundred Millions Place Resources: 2

SWBAT round whole numbers up to the hundred millions.

11
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.

13
Front End Rounding: Difference with Decimals Resources: 1

SWBAT use front end rounding to estimate the difference of whole numbers and two positive decimals.

12
Regrouping to Estimate: Sum or Difference Resources: 2

SWBAT use regrouping to round whole numbers up to the ten thousand to compute the sum.

13
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.

14
Estimation Techniques: Computations $1,000 Resources: 2

SWBAT use estimation techniques to solve whole number computations of amounts no greater than $1,000

12
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

11
Reasonableness of Answer Resources: 2

SWBAT judge the reasonableness of an answer by using estimation.

8
Approximation to Solve Whole Number Computations Resources: 2

SWBAT select the exact answer or the approximation to solve whole number computations.

9

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