Question

A)Estimate 49% of 162. b) Use mental math to calculate 49% of 162. plz help i need to know fast

Answer 1

(a)

Given expression: 49% of 162

we can write 49% as
`(49)/(100)`

then;

`(49)/(100) * 162 = (49 * 162)/(100) = (7938)/(100)=79.38`

Therefore, the estimate of the given expression is, 79.38.

(b)

Using mental math to calculate 49% of 162.

Mental math is used as a way to calculate an estimate quickly.

We can write 49% = 50% -1%

(50%-1%) of 162 = 50% of 162 -1% of 162

so,

50% of 162 =
`(50)/(100) * 162 = (1)/(2) * 162 = 81`

and

1% of 162 =
`(1)/(100) * 162 = (162)/(100) = 1.62`

Now, subtract these we get;

81 - 1.62 = 79.38

Therefore, by using mental math 49% of 162 is, 79.38