Number Properties: Hard Test 4
15 questions · 15 minutes
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Example questions from this paper
A preview of the wording. The answer options and full explanations appear once you begin.
- What is the highest common factor (HCF) of 72 and 120?
- What is the lowest common multiple (LCM) of 14 and 21?
- Which of these numbers has exactly 4 factors?
- Exactly one of these numbers is prime. Which is it?
- Chocolate bars come in packs of 12 and straws come in packs of 18. What is the smallest number of each that can be bought so that there is one straw for every chocolate bar?
Before you begin, remember
- A number is divisible by 3 if its digits add to a multiple of 3, and by 9 if they add to a multiple of 9. This turns a long division into a two-second check.
- Know the square numbers to 15 x 15; they appear in area, algebra and sequence questions as well as here.