Math Trick

Sometimes, students find it difficult to do the math. To overcome this, a teacher must be able to find an alternative learning process so as not boring. This is commonly called a mathematical trick. Mathematical trick facilitate students perform operations of addition, subtraction, multiplication, or division in a way easier, faster, and interesting.

Multiply Up to 20X20 In Your Head

In just FIVE minutes you should learn to quickly multiply up to 20×20 in your head.  With this trick, you will be able to multiply any two numbers from 11 to 19 in your head quickly, without the use of a calculator.

I will assume that you know your multiplication table reasonably well up to 10×10.

Try this:

• Take 15 x 13 for an example.
• Always place the larger number of the two on top in your mind.
• Then draw the shape of Africa mentally so it covers the 15 and the 3 from the 13 below. Those covered numbers are all you need.
• First add 15 + 3 = 18
• Add a zero behind it (multiply by 10) to get 180.
• Multiply the covered lower 3 x the single digit above it the “5” (3×5= 15)
• Add 180 + 15 = 195.

That is It! Wasn’t that easy? Practice it on paper first!

I have another Math Trick that you can apply at any number