IGCSE Mathematics: Number | Questions by Topic

Past paper questions, key definitions, and mark schemes — all files verified from our archive.

• Integers: whole numbers (… -2, -1, 0, 1, 2 …)
• Prime numbers: numbers with exactly two factors (1 and itself)
• Factors: numbers that divide exactly into a given number
• Multiples: result of multiplying a number by an integer
• HCF: highest common factor of two or more numbers
• LCM: lowest common multiple of two or more numbers
• Standard form: a × 10ⁿ where 1 ≤ a < 10
• Percentage change = (new – old) / old × 100%

+ more definitions available in the full revision notes

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