Question

Perform the following calculations without rewriting the numbers in decimal form.

. (1.42 × 10^15) − (2 × 10^13)

Answer 1

Answer will be
`140* 10^(13)`

Explanation:

We have to perform the calculation
`(1.42* 10^(15)-2* 10^(13))` without changing into decimal

`1.42* 10^(15)` can be written as
`142* 10^(13)`

So
`1.42* 10^(15)-2* 10^(13)=(142* 10^(13)-2* 10^(13))`

Now taking
`10^(13)` common

`10^(13)(142-23)=140* 10^(13)`