Its approximate calculation.
You round up or down and leave one significant figure on all numbers in the calculation.
Say its 2354 * 128
So: 2000 * 100 = 200000
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by adding or subtracting the values of the digits in the front place
23
an estimating technique in which the front digits of the addends are added and then the sum is adjusted for a closer estimate
2,000. A front-end estimation just means to round it by the greatest value, in this case the thousands.
It is 200.