302 + 412 = 577 Use rounding or compatible numbers to estimate the sum

Rounding numbers or compatible numbers are usually use to be able to calculate a certain number easier and faster.

For the given equation, we have 302 + 412 which is equals to 714 not 577.

Now, let’s look for a rounding or compatible number to estimate the sum.

=> 302, we have 300 as rounding number or compatible numbers

=> 412, we can have 415 as rounding numbers

=> 300 + 415 = 715.

The exact answer is 714 and our estimated is 715.