CAIE IGCSE Mathematics Extended E1.1.1 Identify and Use Natural Numbers Integers Positive Zero and Questions

Work through Core CAIE IGCSE Mathematics factor questions by factorising integers, finding HCF or LCM and applying common multiples.

Exam points

find prime factors and use factorisation to analyse integers
calculate highest common factors and lowest common multiples
use common multiples to solve repeating-event time problems

[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, $\frac{30\times75}{15}$ oe, or answer $2\times3\times5^2$

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CAIE IGCSE Mathematics Extended E1.1.1 Identify and Use Natural Numbers Integers Positive Zero and Questions question 1