Answer the following questions.
What are compatible numbers?
Compatible numbers are numbers that are easy to compute using the four basic operations: addition, subtraction, multiplication, or division. Compatible numbers help you do mental math. It involving rounding numbers to the nearest tens, hundreds, thousands, or ten thousand. For this reason it helps in solve estimating questions.
Find the sum of 512 and 419.
To solve this we must first round the numbers to the nearest tens or hundreds. In this example we round it up to the nearest tens.
Let do some questions using the four basic operations.