 # Knowledge Base

Most Useful Content for Parents, Teachers & Students

### 8 simple math tricks you will be surprised no one told you of: Ever dreamed of being able to multiply numbers completely in your head? Wouldn’t that be great if you could quickly solve problems like 63 x 25 and 74 x 54?

Good news—you can! Keep on reading to find out how.

There are times in life when you just get lucky. It turns out that one of those lucky little moments occurs each and every time you need to multiply one number by another number that happens to be a power of 5. ### 3. The butterfly method for adding and subtracting fractions

To add or subtract fractions the butterfly way,

. Write the fractions side-by-side as usual and draw two wings along the diagonals made by the numerator of one fraction and the denominator of the other fraction and draw an antenna on each wing.

. As suggested by the wings, that look like a multiplication sign, multiply the numbers in each wing and put the product in the antenna for the wing.

. Think or say: “This poor butterfly needs a body.” To give it a body, connect the bottom parts of the wings with a body like loop and multiply the two denominators it connects, putting the product inside the body.

Add or subtract the numbers in the antennae in keeping with what is being done to the fractions and put the result over the number in the body. ### 4. Memorizing Pi ### 5. Finding the percentage of a number ### 6. Multiplying by 6, 7, 8, and 9 using only your hands

At the age of 8, I had to learn the multiplying tables. I’ve never been good at memorizing lists or tables. It was easy to learn the tables from 1 to 5 but from 6 to 9 it seemed to be way more complicated. ### 7. Finding a Fraction of a whole number Fraction is an area that a lot of kids find hard to understand. One of the problems with fractions is that they have different meanings depending on the context.Once the concept of fractions as numbers and fractions as parts of a the whole has been understood, your child will be well on their way to developing a sound understanding of fractions

### 8. Multiplying by 11 Multiplication by 11 is easy! To multiply by a 2-digit number add the two digits and place the sum in between! 