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skill100.aiskill100.aiThe foundation of all mathematics
Six branches, walked in order — each one makes the next easier. Finish a branch to unlock the next stretch of the path.
Interactive playgrounds — poke, drag and break arithmetic ideas to see how they work.
Natural NumbersThe counting numbers
In progressThe numbers you count with (1, 2, 3…) — ordering, comparing and the number line.
IntegersPositives, negatives & zero
Up nextThe whole-number line extended into the negatives — and why minus times minus is plus.
FractionsParts of a whole
LockedNumerators, denominators, and making peace with common denominators.
Rational NumbersRatios & quotients
LockedAny number that is a ratio of two integers — fractions all grown up.
Irrational NumbersNon-terminating & non-repeating
LockedRoots, Pi, and the numbers no fraction can catch.
LCMLeast Common Multiple
LockedThe smallest common multiple linking numbers together.
HCFHighest Common Factor
LockedThe greatest divisor that fits perfectly into two or more numbers.
DecimalsTenths & beyond
LockedPlace value past the point — reading, comparing and computing with decimals.
PercentagesPer hundred
LockedDiscounts, interest and growth — fractions dressed for real life.
Not sure where you stand? A 10-minute discovery test places you on the path automatically.
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