CAIE IGCSE Mathematics Extended E1.1 Types of number Question Bank
Practise working with factors, multiples and prime factor forms to find HCFs, LCMs and number products accurately.
- Syllabus
- 2028–2030
- Topic
- E1.1
- Level
- Extended
Exam points
- write numbers as products of prime factors using factor trees, tables or lists
- use prime factors or lists to find the HCF or LCM of two numbers
- recognise factors, multiples and square-number products from integer properties
Covered syllabus points
E1.1 Types of number question 1
[Maximum number: 2]
Find the lowest common multiple (LCM) of 30 and 75.
150
B1 for answer $150k$
or M1 for prime factors of 30 or 75 seen, a list of multiples of both 30 and 75 with at least 3 of each, 1530×75 oe, or answer $2\times3\times5^2$
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