Question

Describe how you can use compatible numbers to estimate 17x27

Answer 1

you can use a multiples chart or a calculator

the answer is: 459

Answer 2

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.

Explanation: