The Answer to Flipping Digits Puzzle
Exercise #1:
Turn 999 into 999,666 in 2 moves.
- 999 + 999,000 = 999,999
- 999,999 - 333 = 999,666
Exercise #2:
Turn 6,969 into 9,696 in 2 moves.
- 6,969 - 303 = 6,666
- 6,666 + 3,030 = 9,696
Exercise #3:
Turn 99,999 into 66,966 in 1 move.
- 99,999 - 33,033 = 66,966
Exercise #4:
Turn 999,666,999 into 96,969 in 3 moves.
- 999,666,999 - 999,600,000 = 66,999
- 66,999 - 30,000 = 96,999
- 96,999 - 30 = 96,969
Exercise #5:
Turn 699,996 into 966,669 in 2 moves.
- 699,996 + 300,003 = 999,999
- 999,999 - 33,330 = 966,669
Exercise #6:
Turn 666,969,999 into 66,999 in 1 move.
- 666,969,999 - 666,903,000 = 66,999
Exercise #7:
Turn 999,999 into 969,999,696 in 2 moves.
- 999,999 + 969,000,000 = 969,999,999
- 969,999,999 - 303 = 969,999,696
P.S.: There may be another way to solve some of these exercises, but here are the ones I recommend!
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© Derek Cumberbatch