Math Tips and Tricks
11 times any two digit number
If you were to multiply, say 11x32, add the digits of 32 (so 3+2=5) and put the sum between 32 so it would become 352.
If by any chance you get 2 digits in the sum there will be a change like 11x79 (so 7+9=16), add the 1 from 16 to the 7 leave 6 in the middle and 9 in the end 869 so you would get.
11 time any one-digit number
Take any number you want to multiply with 11, multiply it with 10 and add the original number you wanted to multiply once more
For example
11x47
47 x 10 + 47 = 470 + 47=517
Hard to multiply numbers
If you have a large number to multiply with another and one of them is even , you can easily subdivide them to get the answer
For example
32 x 125 is the same as
16 x 250 is the same as
8 x 500 is the same as
4 x 100 = 4000
If you multiply 6 by an even number, they both end in the same digit.
Example: 6×2=12, 6×4=24, 6×6=36, etc
If you need to square a 2 digit number ending in 5, you can do so very easily with this trick. Multiply the first digit by itself + 1, and put 25 on the end. That is all!
For example:
252 = (2x(2+1)) & 25
=(2 x 3)X25
=625