Factors of a number
Factors of n: every factor, the pairs and the prime factorisation, worked.
40 pages · factors, primes, multiples, LCM and HCF, roots, number names, roman numerals, binary · with the method
The maths library: every number, worked
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By topic
What is in the library
Is it a prime number?
Is n a prime number: the divisibility checks up to the square root, worked.
Multiples of a number
Multiples of n: the first twenty, how to find them, common multiples.
GCF of two numbers
Greatest common factor by listing, prime factorisation and euclid's algorithm.
HCF of two numbers
Highest common factor by listing, prime factorisation and the division method.
LCM of two numbers
Least common multiple by listing, prime factorisation and the ladder method.
Square root of a number
Square roots exact or to three decimal places, simplified, by the long-division method.
Cube root of a number
Cube roots exact or to three decimal places, by prime factorisation and estimation.
Numbers in words
Numbers in words in the international and indian systems, with the place-value chart.
Roman numerals
Numbers to roman numerals and back, with the rules and the breakdown.
Numbers in binary
Decimal to binary by repeated division, with octal and hexadecimal.
Number tables
Squares, cubes, roots, primes, roman numerals and number names from 1 to n.
why the working matters
✍️ The answer is one mark; the method is the rest
A child who copies "the LCM of 15 and 21 is 105" has one line of homework. A child who can show the ladder, or the prime factorisation, or the formula, has the mark scheme. Every page here shows the working the way a teacher wants it written, which is also the way a child remembers it.
when a page is not enough
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