4 x 8 = 32. Add 2 zeros.
40 x 80 = 3200
GIMME THE ANSWER
mental math
40000
move the decimal point to the right one space
Oh, dude, that's easy peasy lemon squeezy! You just gotta remember that multiplying by 100 is like adding two zeros to the end of the number. So, 4 times 100 is 400. Boom, done! No need for a calculator, just flex those mental math muscles.
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.
197
You
3.4
No difference. Both require you to think it out rather than write it out.
You can, if you wish.
70
mental math
x=62