What are the five rules of significant figures(for year 9)?

All non zero numbers  are significant, zero between two non digits are significant, leading zero's are not significant, railing zeros to the right of the decimal ARE significant, Trailing zeros in a whole number with the decimal shown ARE significant.

Step-by-step explanation,

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.