IXL | Estimate sums using compatible numbers up to 100 | 2nd grade math

Use compatible numbers to estimate

78

+

51

.

First, pick the better pair of compatible numbers.

80

+

50

70

+

50

Now, use your choice to estimate the sum.

78

+

51

is about

.

ref_doc_title.

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

0

Time
elapsedTime

hr	min	sec
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SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

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Work it out

Not feeling ready yet? This can help:

N.3Add a multiple of 10 to a two-digit number