Number Properties: Hard Test 5
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 105 and 135?
- What is the lowest common multiple (LCM) of 4, 6 and 10?
- Which of these numbers has exactly 5 factors?
- How many prime numbers are there between 30 and 50?
- Two numbers have a highest common factor of 9 and a lowest common multiple of 90. One of the numbers is 18. What is the other number?
Before you begin, remember
- Know the square numbers to 15 x 15; they appear in area, algebra and sequence questions as well as here.
- Learn the primes up to 50 by heart: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47. Remember that 1 is not prime and 2 is the only even prime.