8000 + 3000 = 11000
500 + 400 = 900
Front end estimation is simpler but usually more crude.
you can use it to check an answer
That equals 559. If you have to, estimate 210 + 350 = 560
280 + 500 = 780
by adding or subtracting the values of the digits in the front place
515+777=
8 + 11 = 19
When using front-end estimation, we add or subtract the front digits, and then adjust for a more accurate estimation by estimating the sum of the digits to the right of the decimal point.
30
It is 15.
When using front-end estimation, first you add the front-end digits. Then adjust by estimating the sum of the remaining digits. Then add the two values
2.0638
By using front end estimation, the numbers that you start of with have only one significant digit. It is, therefore, nonsense to have an answer with loads of significant digits.
500 + 400 = 900
10 + 1 + 4 = 15
2000 x 200 = 400000