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ELI5 Yahaaa

Faster than one at a time

Counting in Jumps

Counting in twos, fives or tens gets you there quicker — and builds times tables.

One at a time 1, 2, 3, 4, 5, 6…In jumps of two 2, 4, 6, 8, 10…
Same destination, fewer stops.
  1. Step 1 of 5

    Counting one by one is slow.

    Ten singlesAnd ten more — a lot ofsteps

    To count twenty socks singly takes twenty steps and twenty chances to lose your place.

  2. Step 2 of 5

    If things come in groups, jump by the group.

    1 Count the pairs2 2, 4, 6, 8…3=Half the steps

    Socks come in pairs, so count 2, 4, 6, 8. Ten pairs takes ten steps instead of twenty, and you cannot lose a sock in the middle.

  3. Step 3 of 5

    Fives and tens are the friendliest jumps.

    Counting in tens10 steps to 100Counting in fives20 stepsCounting in ones100 steps

    Fingers come in fives and our number system runs on tens, so 5, 10, 15, 20 and 10, 20, 30 feel almost automatic.

  4. Step 4 of 5

    Skip counting is a times table in disguise.

    Skip counting by 3 3, 6, 9, 12, 15The 3 times table 1×3, 2×3, 3×3, 4×3, 5×3

    Counting 3, 6, 9, 12 is exactly the three times table. Every jump you land on is another multiple of three.

  5. Step 5 of 5

    It shows you patterns as you go.

    1 Count in fives2 Notice everyanswer ends 0or 53?Now predict thenext one

    Count in fives and every answer ends in 5 or 0. Count in nines and the digits always add up to nine. The jumps reveal structure.

    Clock faces are skip counting made physical — every number is a jump of five minutes.

The short version

Skip counting moves in equal jumps, which is faster than counting singly and builds the times tables.

Try it yourself

Count the fingers in a room by fives instead of ones. You will get there several times faster.

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