A price goes from $80 to $100 — by what percent did it rise? These free printable worksheets give the before and the after and ask for the percent of change, the reverse of finding a new amount.
If they get stuck
The answer key prints on a separate page.
The increase-and-decrease sheet gives the percent and asks for the new amount; this one gives both amounts and asks for the percent. It is the reverse move, and it is the one a shopper actually makes — a tag says $80 was $100, and “20% off” is what you work out. Find the difference first, then ask what fraction of the ORIGINAL that difference is.
Out of the original, never the new — that is the one thing this skill turns on. From 80 to 100 the change is 20, and 20 out of the starting 80 is 25%, not 20 out of 100. The question always names the direction (“the increase from…”, “the decrease from…”) so the answer is a plain positive percent, and every step-by-step walk divides by the amount you started with.
the decrease from 105 to 84