Question

Rico is estimating 139 X 18. Find his mistake and correct it. 100 X 10= 1000

Answer 1

It probably should be 140 x 20 because 5 and up you round it up

Answer 2

2800

Explanation:

We have been given that Rico is estimating
`138* 18`. We are asked to find Rico's mistake.

We can see that Rico has rounded down 139 to 100 and 18 to 10.

Instead of rounding down the numbers, Rico should round up the numbers as ones place is greater than 5:

`140* 20`

`2800`

Therefore, the estimated product of the given numbers would be 2800.