A student performs the following estimations.
26+180210
115+391510
497+20242520
Based on these estimations, which of the following is the student’s estimate of 545+7501?
8030
8060
8160
8050
Correct Answer : D
From the given estimations, we can find the exact sum after adding the given numbers and see the trend the student utilizes to find their estimates. The actual sum is as follows
26+180=206
115+391=506
497+2024=2521
From the above evaluation, the students round the exact sum to the nearest tens. So, in the problem we need to approximate 545+7501.
545+7501=8046
The exact sum is 8046 and the approximate value after rounding to the nearest tens is 8050.
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