Basic Math Examples

Estimate 656-521
656-521
Step 1
Round 656 to 650.
650-521
Step 2
Round -521 to -500.
650-500
Step 3
Subtract 500 from 650.
150
Step 4
The approximate value of 656-521 found by front end estimation.
656-521150
656-521
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 [x2  12  π  xdx ]