akabadatmath akabadatmath

02-10-2015
Mathematics

contestada

add or subtract mentally 16.9+ 12.1

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Brionna97 Brionna97

02-10-2015

When you add it mentally you'd get 29
When you subtract it mentally you'd get 4.8

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Percy2Chase Percy2Chase

02-10-2015

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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