Posted by jp on .
How do you find 81  16 using mental math?

subtraction (math) 
Ms. Sue,
I'd round the numbers to 80  15

subtraction (math) 
Delilah,
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.

subtraction (math) 
Tatiana,
Your butt plus my bütt ID thesse nuts

Al_hade 
Heba,
Explain it tell how to find 8116 using mental maht