It is 30.
The front end estimate is 600.
The first digit is 1, in the tens place. So the front end estimate is 10.
To the nearest integer, 2
To the nearest integer, 8
To the nearest integer, 3
It is 600.
A front end estimate is 900.
To the nearest thousand, 2000
by adding or subtracting the values of the digits in the front place
515+777=
11
Front end estimation generally produces a better estimate of sums or differences than rounding before adding or subtracting. How to Estimate a sum by front end estimation * Add the digits of the two highest place values * Insert zeros for the other place values * Example 1: 4496 + 3745 is estimated to be 8100 by front end estimation (i.e. 4400 + 3700). * Example 2: 4496 + 745 is estimated to be 5100 by front end estimation (i.e. 4400 + 700).