Question

Ted is asked to multiply `10^2 times 18.72`. How should he move the decimal point to get the correct product?

Answer 1

`10^2xx18.72=1872`

Explanation:

As here we have a decimal system

each multiplication will increase the number `10` times

i.e. move the decimal point one place - for example multiplying `18.72` by `10` will move the decimal point to right (note that moving to left will reduce the number, but multiplying increases it) by one point and make it `187.2`.

But here we have `10^2xx18.72=10xx10xx18.72` i.e. we are multiplig it by `10` twice. Hence we move the decimal point two places to the right.

Hence, `10^2xx18.72=1872`