Add or subtract mentally 16.9+ 12.1
2 answers:
When you add it mentally you'd get 29
When you subtract it mentally you'd get 4.8
Well, just add or subtract it form the back and work your way to the front, and you have to remember what the digit was.
16.9 + 12.1 = 29
16.9 - 12.1 = 4.8
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