Me understand how to order integers.

If there are fraction, just turn them into decimal
- 1/3 = -0.3333                     1/3 = 0.3333

when ordering them just think of a number line, because a number line start from negative to positive, then just put the negative numbers first if it asks you to "order from least to greatest" if it asks "order from greatest or least" then put positive numbers first

-0.5 < 1/3 < 1/3 < 0.5 < 1.25

The answer is -0.5, -1/3, 1/3, 0.5, 1.25.

This is because, if you convert all the fractions into decimals, it will be -0.5, -0.33333, 0.333333, 0.5, and 1.25. For positive numbers you order it from least to greatest. For negative integers, I ignore the sign and order it, but in reversed order as the question asks. If this method is too hard, then just think that for negative integers, it is just like an opposite world where big things are smaller.

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.

Were is the diagram?