Subtracting 9

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
9 - 9 =
10 - 9 =
11 - 9 =
12 - 9 =
13 - 9 =
14 - 9 =
15 - 9 =
16 - 9 =
17 - 9 =
18 - 9 =