Assessing the Reasonableness of Subtraction with Rounding

Assessing the Reasonableness of Subtraction with Rounding

Assessment

Interactive Video

Mathematics

1st - 6th Grade

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

The video tutorial teaches how to assess the reasonableness of subtraction results by using rounding. It explains the concept of rounding numbers to the nearest place value to estimate and check if a calculated difference is reasonable. Two examples are provided: Stephanie's subtraction of 298 from 410, which is deemed unreasonable, and Chris' subtraction of 187,600 from 508,000, which is considered reasonable. The tutorial emphasizes understanding rounding errors and their impact on the reasonableness of results.

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5 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is one method to verify if a subtraction answer is reasonable?

Recalculate the problem using a calculator

Check if the answer is a whole number

Use rounding to estimate the difference

Compare the answer with a friend's answer

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In Stephanie's problem, what was the estimated difference after rounding?

300

200

100

400

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why was Stephanie's answer considered unreasonable?

The numbers were not rounded correctly

Her answer was too close to the estimated difference

Her answer was a negative number

The estimated difference was much smaller than her answer

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What was the estimated difference in Chris' subtraction problem after rounding?

280,000

300,000

320,000

350,000

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How did rounding errors affect the reasonableness check in Chris' problem?

They made the estimate larger than the actual difference

They had no effect on the estimate

They caused the estimate to be off by 20,400

They made the estimate exactly match the actual difference

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