# 5 Math Tricks To Speed Up Calculations

## A Must read for all appearing for SOF Olympiads

Here we are going to discuss some of the Math tricks which will help you do calculations at the faster speed. These tricks are a kind of helping hand in your exam time, saving a lot of time and scoring more. Efficiency come with practice but these math tricks will increase your speed and help you do math calculations faster.

- Square and square root of a number ending with 6
- Multiplication of 11 with any number of 3 digits.
- PERCENTAGE COMPUTATION
- Addition of common difference in a series of numbers
- Five Digit cube and cube root trick

Example: 762

Step 1. Put down 6

Step 2. Multiply 2 with (7 + 1) = 16 and add 16+1= 17. Put down 7 and carry 1

Step 3. Multiply 7 with (7 + 1) = 56 + carry 1 = 57 put down 57

Answer. 5776

Let me explain this rule by taking examples

1. 352*11 = 3---(3+5)---(5+2)---2 = 3872

Means insert the sum of first and second digits, then sum of second and third digits between the two terminal digits of the number

213*11 = 2---(2+1)---(1+3)---3 = 2343

Calculate 65% of 460:

Step 1: 50% of 460 = 230

Step 2: 10% of 460 = 46

Step 3: 5% of 460 = 23 (half 46)

Result: 65% of 460 = 299 (sum)

We need to add the larger number with smaller number, After that multiply this add result by count of numbers in the series of numbers, at last we have to do that we divide the result by 2.

39, 49, 59, 69 and 79

Step 1: Add the larger number with small number that is 79 + 39 = 118

Step 2: Then multiply the add result 118 × 5 = 590

Step 3: At last divide the number by 2, 590/2 = 295

Need to remember 1 to 10 cube.

Example: 3√13824 =?

Answer:

Step 1: Last digit of cube number from right side is 4 that we consider 64 = 43 we put down 4.

Then

Step 2: Take the number whose cube is nearest to 13.

That is 13 is nearest to 23 and 33, we take small one cube digit that is 2.

So the answer is 24.

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