5 Math Tricks To Speed Up Calculations - SOF Olympiad Trainer Blog
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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.

  1. Square and square root of a number ending with 6

  2. 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

  3. Multiplication of 11 with any number of 3 digits.

  4. 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

  5. PERCENTAGE COMPUTATION

  6. 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)

  7. Addition of common difference in a series of numbers

  8. 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

  9. Five Digit cube and cube root trick

  10. 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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