### 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?

### What Number?

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

### One of Thirty-six

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

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