Problems

Set One

1.   45 + 58
2.   67 + ___ = 121
3.   8001 - 7998
4.   26 + ___ = 52
5.   81 - 67
6.   456 + 144
7.   789 - 85
8.   ___ + 58 = 189
9.   33 + 809 + 67 + 91

Use Explain Everything to show your answers and your working out.
How you find the answer is more important than the answer itself.