In the class of 24 students, half are doing silent reading, and a third are playing board games. The rest are catching up on homework. How many students are catching up on homework?
Let’s work this out in a step by step way to be sure we have the right answer.
4
24 / 2 = 12 students are doing silent reading.

24 / 3 = 8 students are playing board games.

So 12 + 8 = 20 students are accounted for.

Then 24 - 20 = 4 students are catching up on homework.

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The answer: 4