|68 can be changed to 1 by using only the number 4 key, together with any of
the operation keys. For example,
Find other numbers that can be changed to 1 using only the 4 key and any operation.
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Try other key numbers
17 - 5 = 12
- 5 = 7
- 5 = 2
x 5 = 10
- 5 = 5
÷ 5 = 1