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Writing Digits

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?

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What Number?

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

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One of Thirty-six

Can you find the chosen number from the grid using the clues?

6 Beads

Stage: 1 Challenge Level: Challenge Level:2 Challenge Level:2

If you put three beads onto a tens/units abacus you could make the numbers $3$, $30$, $12$ or $21$.

abacus

Explore the numbers you can make using six beads.
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