Compatible numbers are pairs of numbers that are easy to add, subtract, multiply, or divide mentally. When using estimation to approximate a calculation, replace actual numbers with compatible numbers. The numbers 500 and 300 are compatible for addition, since the sum of 800 can be easily calculated mentally.

What is the example of compatible numbers?

Some examples of compatible numbers when doing addition are 225 and 75, 298 and 2, and 540 and 60. Some examples of compatible numbers when doing subtraction are 435 and 25, 800 and 600, and 5986 and 2986. When estimating, keep in mind that we are not claiming the answer will be exact.

What is compatible number in math?

Compatible Numbers. Compatible numbers are pairs of numbers that are easy to add, subtract, multiply, or divide mentally. When using estimation to approximate a calculation, replace actual numbers with compatible numbers.