Question

1.2 x 10 to the negative 3rd / 4 x 10 to the 6

Answer 1

`3 \cdot 10^(-10)`

Explanation:

`(1.2\cdot 10^(-3))/(4\cdot 10^(6))=(12\cdot 10^(-4))/(4\cdot 10^(6))\\\\=(12)/(4)\cdot 10^(-4-6)=3\cdot 10^(-10)`

I like to adjust the operands so the quotient needs no adjustment. Here that means rewriting the numerator to an equivalent value with a mantissa between 4 and 40.