Number ToolkitCambridge IGCSE Maths: Flashcards

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What is a natural number?

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What is a natural number?: A positive whole number used for counting (1, 2, 3, ...).
What is a prime number?: A number greater than 1 with exactly two factors: 1 and itself.
What is a rational number?: A number that can be written as an exact fraction of two integers.
What is an irrational number?: A number that cannot be written as an exact fraction, e.g. π or √2.
What is the reciprocal of a number?: 1 divided by that number; for a fraction, swap the numerator and denominator.
What does BIDMAS stand for?: Brackets, Indices, Division, Multiplication, Addition, Subtraction — the order of operations.
What is 5 - (-3)?: 8, since subtracting a negative is the same as adding.
What is the result of multiplying two negative numbers?: A positive number.
What is the result of multiplying a negative number and a positive number?: A negative number.
Write six billion in figures.: 6 000 000 000
What squares should you memorise without a calculator?: Squares from 1² to 15² (1 to 225).
Which cube numbers should you memorise without a calculator?: The cubes of 1, 2, 3, 4, 5 and 10 (1, 8, 27, 64, 125, 1000).
What is the square root of 144?: 12
What is the cube root of 125?: 5
The temperature is -4°C and rises by 9°C. What is the new temperature?: -4 + 9 = 5°C