Grade Level: 4th Skill: Reasoning Topic: Estimate if an Answer is Reasonable Goal: Use estimation to verify the reasonableness of calculated results. Skill Description: Estimate to check the results of addition, subtraction, division, and multiplication problems.

## Building Blocks/Prerequisites

### Sample Problems

(1)

Estimate the sum:

6,878

+4,217

(11,000)

(2)

Find the compatible number to estimate the quotient:

375 ÷ 6 = _____ (360 ÷ 6 = 60)

(3)

Find the difference. Estimate.

4,190

- 2,816

(1,374)

Estimate: _______ (1,000)

(4)

Estimate the product:

\$25.67

x 4

(26 x 4 =104)

(5)

Use the chart to calculate the actual distance and estimated distance that the Jamming Jets Track team ran during practice for one week.

 Day of the week Actual distance (miles) Estimated Distance Monday 5.2 □ (5) Tuesday 7.4 □ (7) Wednesday 3.1 □ (3) Thursday 9.7 □(10) Friday 4.6 □(5) Total miles ran □ (30) □ (30)

What did you notice about your total for the estimated and calculated amounts? (They are the same, estimating would really be beneficial in this problem)