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
To find the product of 4x100 using mental math, you can first recognize that multiplying any number by 100 simply involves adding two zeros to the end of that number. So, 4x100 is the same as 4 with two zeros added, which equals 400.
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
3.4
You
No difference. Both require you to think it out rather than write it out.
You can, if you wish.
70
mental math
x=62