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Mathematics
Aiden
27 May, 10:19
Add or subtract mentally 16.9 + 12.1
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Ruth Richards
27 May, 10:38
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When you add it mentally you'd get 29
When you subtract it mentally you'd get 4.8
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Piper Leblanc
27 May, 13:34
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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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