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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