Solution:
Front-end estimation is a particular way of rounding numbers to estimate sums and differences.
To use front-end estimation, add or subtract only the numbers in the greatest place value. Then add the decimals rounded to the nearest tenth.
In front-end estimation, we replace the original number with a number that's close by but only has one non-zero digit.
The front-end strategy is a method for estimating an answer to a calculation problem by focusing on the "front-end" or "left-most" digits of a number. Its strongest application is for addition.
Front-end estimation generally produces a better estimate of sums or differences than rounding before adding or subtracting.