Question

Select all ratios equivalent to 8:2.
4:1
2:7
20:5

Answer 1

4:1 and 20:5

Explanation:

If you can divide a ratio by the same number on both sides without a remainder or decimal, they are equal. Multiplying a ratio by the same number will always give an equal ratio.

An easy way to find a smaller ratio is to find the GCF and divide it by that. In this case, 8 and 2's GCF is 2. Dividing both sides by 2 makes it:

4:1

That already gives us one answer, but we can check the second one. Dividing 4 by 2 will get one side right, but the other side is not 7, so it can't be the 2nd option.

Multiplying both sides by 5 gives 20:5, which is equal.