The same as if you do it on paper - but you'll have to remember all the details in your head.
how to do mental math useing propertys
No difference. Both require you to think it out rather than write it out.
You can, if you wish.
you answer it!
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how to do mental math useing propertys
510 divide by 52 using mental math and using long div = 9.807692307692308
GIMME THE ANSWER
5*9 = 45 so 50*90 = 4500.
371
You
3.4
4 x 8 = 32. Add 2 zeros. 40 x 80 = 3200
No difference. Both require you to think it out rather than write it out.
mental math
70
You can, if you wish.