Question

Work out (8x10^-3) x (2x10^-4)​

Answer 1

`1.6 * 10^(-6)`

Explanation:

`(8 * 10^(-3)) * (2 * 10^(-4))`

`8 * 2 * 10^(-3) * 10^(-4)`

`16 * 10^(-3+(-4))`

`16 * 10^(-3-4)`

`16 * 10^(-7)`

`1.6 * 10^(-6)`

Answer 2

(8 × 10^-3)× ( 2× 10 ^-4)

reorder the terms

You will get

(8 × 2) ( 10^ -3 × 10^-4)

Multiply

16 ( 10^ -3 × 10^-4)

Use the rules of indices

a^ b × a^ c = a^b+c

16(10^-3-4)

16(10^-7)

= 16 × 10^-7 or 1.6 × 10^-6 or 0.0000016

Hope this helps.