04 Try it yourself Interactive

Both types, and the base that decides them

Pick the two numbers and which question you are asking. Type 1 gives a value; Type 2 gives a percentage and then shows what swapping the base would have produced. Running the same pair both ways once is the fastest way to make the “of” rule stick.

What is 65% of 40?
13/20 × 40 = 26
In Type 2, the second number is the base — the one that follows “of” in the question.
Press Next to work through it one step at a time.
As a fraction–
Base–
Answer–
Reversed–
step 0 / 0