Folding Expanded Form
Activity, Stage 4 – Expanded Form and Place Value
This gives a physical way to see how two-digit numbers are formed from tens and ones.
Take a piece of paper that exactly fits four Number Cards side by side. Mark the paper with: Space – “0” – “+” – Space. Have vertical folds on both sides of the “+” sign. Paper clip numbers to the two spaces. If you use 2 and 3, folded up this looks like 23, but unfolded this becomes 20 + 3.