Well done for completing level 1!
Look at the abacus below.
Each column of beads represents a 'place' value.
The column on the right is the 'ones' place (1-9) and the column on the left is the 'tens' place (10-99).
This abacus shows 3 tens and 1 unit.
This is 30 + 1.
The number shown on the abacus is 31.