Tens and ones: numbers to 100

This studio is for Year 1. The sentences are short; read them aloud if your child can't read yet. The picture above each mission shows which button to press.

Each column is a place: the ones on the right, the tens on the left. Under each column, the place-value chart shows that column's digit.

The ← 10 button bundles ten ones into one ten. The 1 → button breaks a ten into ten ones. The number stays the same; only the way it is made changes.

If a column holds 10 or more, its digit turns red: only one digit fits in each place. So it's time to exchange.

Use the buttons above the picture to switch to the abacus, which shows the same thing with beads.