Question

24 cheer teams competingin each team. Select all the expressions that NOT good ways to use compatible numbers to estimate the number of cheerleaders competing. 18 X 60 are nation given 20 x 20 25 X 18 18 X 24 acation. She ty to send to ostage for each 10 X 10 20 X 15 you need

Answer 1

Step-by-step explanation:

Compatible numbers are numbers that are very easy to multiply mentally and are close to the numbers we actually want to multiply.

In this case the number of cheerleaders competing is:

`18*24=432`

But this product is not very fast to solve. However, 20 is pretty close to 24 and to 18, so one way of estimating this product is 20 x 20 = 400.

10 x 10 is not a good way of estimating, because the result is 100 and it's very far from the actual result.

20 x 15 is 300, it's not a very good estimation either, because it's 132 units away from the actual result.

18 x 24 is not a good way either, because that's not using compatible numbers but doing the actual product.

and 25 x 18 is just using a close number.

Answers:

• 25 x 18

• 18 x 24

• 10 x 10

,

• 20 x 15