Question

Write the ratio in lowest terms with whole numbers in the numerator and denominator.

10.15 hr to 8.12 hr

(Show steps please & thank you!)

Answer 1

multiply by 100 and simplify completely

Answer 2

multiply by 100 both the numerator and the denominator and simplify completely

Answer 3

How do I get them to lowest terms? Prime factorization?

Answer 4

http://drrobinson.com/TCC/0002SP07/5-1%20&%205-2%20Ratios%20&%20Rates.pdf
exercise no. 1

Answer 5

rules of divisibility or prime factorization

Answer 6

helps to know that
\[1015=5\times 7\times 29\] and
\[812 = 2^2\times 7\times 29\] so that
\[\frac{1015}{812}=\frac{5}{7}\]

Answer 7

oop
\[\frac{1015}{812}=\frac{5}{4}\] looks better

Answer 8

http://www.youtube.com/watch?v=nVbv1mEiHx8

Answer 9

@satellite wish Lynn could do it ! do you think your method helped her understand ?

Answer 10

Wait.. why is it 5/4 now? :|

Answer 11

I got 5/7.. at first.

Answer 12

...Because 2^2 = 4?

Answer 13

I think I got it.

Answer 14

yes that is why
you have a choice, either factor both numbers and cancel all common factors, or cancel on piece at a time. but in this case it is unlikely that you would recognize that both numbes are divisible by 29 unless you started out slow. or divisible by 7 for that matter. you would just have to check

Answer 15

for example 1015 is clearly divisible by 5 so divide by 5 and get
\[1015=5\times 203\] but the only way you are going to know that 203 is divisible by 7 is to try it
then you will see that
\[203=7\times 29\] and since 29 is prime you are done

Answer 16

Thank you :)