Ten-Digit Sum Estimation

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About this activity

Estimate two-digit sums by rounding to tens

Created by

Rafia Latif

Pakistan

Download the paper version to play

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Ten-Digit Sum EstimationOnline version Estimate two-digit sums by rounding to tens by Rafia Latif 1 For 58 + 33, rounding to 60 and 30 and adding gives 90. Yes No 2 The exact sum of 47 + 26 is 120. Yes No 3 This method avoids borrowing because we only add the tens after rounding. Yes No 4 Round each two-digit number to the nearest ten and add the results (e.g., 47→50 and 26→30; 50+30=80). Yes No 5 If the ones digits are large, rounding to tens changes nothing and is not allowed. Yes No 6 You should round to the nearest hundred, not ten. Yes No 7 The estimated sum by tens is usually close to the actual sum of two two-digit numbers. Yes No 8 The method is valid only for numbers ending in 0. Yes No 9 You must carry over to the hundreds after adding the tens. Yes No 10 If one number is 40 and the other 60, the estimate using tens is 40+60=100, which matches the actual sum in this case. Yes No

Ten-Digit Sum EstimationOnline version

Estimate two-digit sums by rounding to tens

by Rafia Latif

For 58 + 33, rounding to 60 and 30 and adding gives 90.

Yes

The exact sum of 47 + 26 is 120.

Yes

This method avoids borrowing because we only add the tens after rounding.

Yes

Round each two-digit number to the nearest ten and add the results (e.g., 47→50 and 26→30; 50+30=80).

Yes

If the ones digits are large, rounding to tens changes nothing and is not allowed.

Yes

You should round to the nearest hundred, not ten.

Yes

The estimated sum by tens is usually close to the actual sum of two two-digit numbers.

Yes

The method is valid only for numbers ending in 0.

Yes

You must carry over to the hundreds after adding the tens.

Yes

If one number is 40 and the other 60, the estimate using tens is 40+60=100, which matches the actual sum in this case.

Yes

You can integrate the game into an LMS compatible with LTI 1.1 or LTI 1.3 such as Canvas, Moodle, or Blackboard. This way, the scores will be automatically saved into the platform’s gradebook.

Ten-Digit Sum Estimation

Yes or No

About this activity

Created by

Download the paper version to play

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Yes or No

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Yes or No

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Yes or No

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Ten-Digit Sum EstimationOnline version

by Rafia Latif

For 58 + 33, rounding to 60 and 30 and adding gives 90.

The exact sum of 47 + 26 is 120.

This method avoids borrowing because we only add the tens after rounding.

Round each two-digit number to the nearest ten and add the results (e.g., 47→50 and 26→30; 50+30=80).

If the ones digits are large, rounding to tens changes nothing and is not allowed.

You should round to the nearest hundred, not ten.

The estimated sum by tens is usually close to the actual sum of two two-digit numbers.

The method is valid only for numbers ending in 0.

You must carry over to the hundreds after adding the tens.

If one number is 40 and the other 60, the estimate using tens is 40+60=100, which matches the actual sum in this case.

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