Number Properties: Hard Test 7
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 132 and 198?
- What is the lowest common multiple (LCM) of 9, 12 and 15?
- A number less than 50 has exactly 9 factors. What is the number?
- How many prime numbers are there between 100 and 120?
- The table shows four numbers written as products of primes. Which two of them have a highest common factor of 12?
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.