Numbers
Numbers crib sheet
Arithmetic tricks via semi-algebra Binary, Hex and other bases Measurement errors Upper and lower bounds Fractions Learn your squares and cubes Long multiplication Percentages Prime factorization, HCF, LCM Ratio & proportion Standard form Types of number Why primes are interesting Magic squares Fibonacci & the Golden Ratio
Classify the number quiz
First million primes First 55 million primes
Prime factors 2-99999 Prime factors 100000-199999
xls
grid multiplication
KNOW YOUR NUMBERS
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First created July 2012
Last updated May 2025