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1.04 Estimation and reasonable answers

Interactive practice questions

Estimate $99+61$99+61.

a

Round both numbers to the nearest $10$10.

$\editable{}+\editable{}$+

b

Calculate the estimate.

Easy
< 1min

Estimate $63-22$6322.

Easy
< 1min

Estimate $898-132$898132.

Easy
< 1min

Estimate $765+171$765+171.

Easy
< 1min
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Outcomes

F.3

ascertain the reasonableness of answers to arithmetic calculations

F.4

use leading-digit approximation to obtain estimates of calculations

F.6

check results of calculations for accuracy

F.10

apply approximation strategies for calculations

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