Compatible numbers.
Compatible numbers are numbers that are easy to work with mentally and can be used to estimate or simplify a mathematical calculation. They are typically close to the given numbers in terms of magnitude and are chosen in a way to make calculations quicker and more efficient.
For example, when performing division, it is often easier to divide by compatible numbers rather than the exact numbers. If you were trying to divide 327 by 8, you could use compatible numbers by approximating 327 to 320 and 8 to 10. Therefore, the division becomes 320 รท 10 which is much simpler and yields an approximate answer of 32.
Compatible numbers can also be used in multiplication, addition, and subtraction. They are especially useful when making quick mental calculations or estimating the result of a more complex calculation.