Posted by jp on Wednesday, November 14, 2012 at 6:47pm.
How do you find 81 - 16 using mental math?
- subtraction (math) - Ms. Sue, Wednesday, November 14, 2012 at 6:54pm
I'd round the numbers to 80 - 15
- subtraction (math) - Delilah, Thursday, November 15, 2012 at 6:55pm
Just do the problem in your head, don't use any outside sources like a calculator or a paper/pencil. I would also do like Ms. Sue said - round 81 to 80 and 16 to 15.
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