In mathematics, compatible numbers space the numbers that are simple to add, subtract, multiply, or division mentally. Compatible numbers room close in worth to the yes, really numbers that make estimating the answer and computing troubles easier.

You are watching: Are numbers that are easy to compute mentally


We can round the numbers to the nearest ten, hundred, thousand or ten thousand to do them compatible numbers. Because that instance, if we have to add 493 and 549, we have the right to make the numbers compatible by rounding them approximately the nearest tens or hundreds. 490 and 550 (rounded come the nearest tens) or 500 and 500 (rounded to the nearest hundreds) room much less complicated to solve.
*

Let united state see some instances to understand exactly how we deserve to perform subtraction, multiplication and division using compatible numbers.

Subtraction:

Find the difference in between 376.5 and also 612.2

Here, us cannot discover the difference between 376.5 and also 612.2 conveniently as they are not compatible. So, us make the numbers compatible by rounding both the number to the nearest tens.

Actual Difference

Difference using Compatible Numbers

*

376.5 alters to 380

612.2 alters to 610

610 - 380 = 230


Multiplication:

Find the product the 24.3 and 18.7.

It is challenging to uncover the product that 24.3 and also 18.7 mentally and quickly. So, we usage compatible numbers and find the product i beg your pardon is closer come the yes, really answer.

Actual Product

Product utilizing Compatible Numbers

*

24.3 transforms to 24

18.7 transforms to 20

24 × 20 = 480


Division:

Divide 856 by 33.

See more: What Does Riley Mean In Hebrew ? What Does The Name Riley Mean

To find the answer to 856 ÷ 33, will certainly take united state time as we should divide to obtain the answer.

However, if we make the numbers compatible, we have the right to mentally find solution close to the really answer together shown,

Actual Division

Quotient utilizing Compatible Numbers

*

856 changes to 900

33 alters to 30

900 ÷ 30 = 30


*
*