8. To find the answer you can eather multipy it for each of the sides or you can add it 6 times once for each side
[tex] 15\frac{1}{4} \times 6 \\ \\ 15 \frac{1}{4} + 15 \frac{1}{4} + 15 \frac{1}{4} + 15 \frac{1}{4} + 15 \frac{1}{4} + 15 \frac{1}{4}[/tex]
9. You basicly do the same thing as the previous problem but with the new numbers and you add each number 2 times
10. For are you multiply Base × Height So all you have to do is Multiply the 2 numbers shown together
[tex]2 \frac{1}{2} \times 5[/tex]
11-12 Is the same but witb the new numbers
I hope this helps!