change ratio to lowest terms.

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I have homework how much do 72 roses cost is you have that kind of h.w mul and div

Still not sure what you are asking.

Cost per rose times number of roses = total cost

To change a ratio to its lowest terms, you need to find the greatest common divisor (GCD) of the two numbers in the ratio and then divide both numbers by this GCD.

Let's say you have a ratio of a:b. To find the GCD of a and b, you can use a method called Euclid's algorithm:

1. Start by dividing the larger number by the smaller number.
2. If the remainder is zero, then the smaller number is the GCD.
3. If there is a non-zero remainder, replace the larger number with the remainder, and repeat step 1.

Once you have the GCD, divide both numbers of the ratio by it. The resulting ratio will be in its lowest terms.

For example, let's say we have a ratio of 12:18. To find the GCD, we can use Euclid's algorithm:

Step 1: Divide 18 by 12. The remainder is 6.
Step 2: Replace 18 with 12 and 12 with 6.
Step 3: Divide 12 by 6. The remainder is 0.

Since the remainder is zero, the GCD is 6.

Now, divide both numbers of the ratio by the GCD:
12 ÷ 6 = 2
18 ÷ 6 = 3

Therefore, the ratio 12:18 in its lowest terms is 2:3.