Do you hate math? Is doing math without a calculator a pain? Do you never remember your multiplication tables? Don’t worry: it’s a common problem. However, don’t think that all those who seem to be geniuses know how to do complicated calculations in their heads: there are in fact methods thanks to which it is possible to do calculations quickly and that are accessible to everyone, absolutely everyone.
Want to know what these fast calculation methods are? Let’s look at four of them together.
How to multiply large numbers in your head
Check out this method for solving two-digit multiplications without putting them in columns or using a calculator.
The 9 times table
Learning the 9 times table is very simple: you can clearly see in the example below the trick to always remember it.
The Butterfly Method for Adding and Subtracting Fractions
In this case, draw a butterfly between the fractions: as you can see from the image, to solve the fractions more quickly, just multiply the digits in the first set with those of the second and then the two digits to the divisor of the fractions: add the first two, while leaving the result obtained between the two divisors. Here the fraction is solved!
Multiply x 11
In this case, just separate the two digits that make up the factor other than 11 (in the case of the photo, 32). The sum of the two digits is the middle number between 3 and 2 in the product (3+2=5, so the product is 352).
