Science quiz
Lowest common multiples
For each pair, type the smallest number that both divide into exactly. Twenty pairs, with Prev and Next to skip.
- Format
- Type them all
- Items
- 20 answers
- Limit
- 3:00
- Level
- Medium
- Checked
- 2026.10.03
- Answers
- 20
- Time limit
- 3:00
- Order
- One at a time, skip allowed
- Matching
- Case and accents ignored
- The highlighted slot is the one to answer.
- Prev and Next skip around; click a slot to jump to it.
- Enter on an empty box skips; the up and down arrow keys step through the slots.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Type the lowest common multiple of each pair.
About this quiz
The lowest common multiple of two numbers is the smallest number in both of their times tables. It is what you need to add fractions with different denominators.
- The product of two numbers equals their lowest common multiple times their highest common factor.
- When two numbers share no factor, the lowest common multiple is simply their product: 3 and 7 give 21.
- In no pair here does one number divide the other, so the answer is never one of the pair.
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