1's Addition

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!
1. 1+0=
2. 1+1=
3. 2+1=
4. 1+3=
5. 4+1=
6. 1+5=
7. 6+1=
8. 1+7=
9. 8+1=
10. 1+9=