8 Useful Math Hacks That They Didn’t Teach You In School


Math can be really hard sometimes, especially when your entire knowledge universe is bombarded by tons of information and distraction, on a daily basis. If you too are tired of being forced to struggle in math class or wish your kid doesn’t go through the same ordeal, these next tricks will certainly help. Say goodbye to cruel math teachers and their methods in order to welcome these simple hacks. Take a look over the images which show you how to multiply large numbers in your head, add and subtract fractions, and even figuring out percentages. After learning these methods, you will surely amaze your school peers and teachers alike. 

1. Multiples of 9 works in reverse order! Math-Hacks-That-They-Didn’t-Teach-You-In-School-1

2. Your hands can tell you the future … okay, fine, it can tell you multiples of 6, 7, 8, and 9!

Math-Hacks-That-They-Didn’t-Teach-You-In-School-2 Math-Hacks-That-They-Didn’t-Teach-You-In-School-3 Source

3. Butterfly method for adding and subtracting fractions! No fighting over pizza anymore!


4. Reverse Zorro! Starting at the bottom, draw a line from the 4 to the 24 (4 goes into 24 six times). Draw the line to the 3 (six times three is 18). Draw the top line and write the answer.


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11 Responses to "8 Useful Math Hacks That They Didn’t Teach You In School"

  1. Johan says:

    How do you get to the numbers on the date thing?

  2. Daniel says:

    don’t see any working for that date day of week one. so not genius – genius is communication too!

  3. tim says:

    you need to explain the what day of the week it will be or was a lot better cause I don’t see any explanation at all.

    • Catherine K says:

      tim I found a website with the instructions and it was not straight forward. First you memorise a table of numbers for the months which need January and February adjusted if it is a leap year. The days was straight forward, the 20th day of the month will be the same day of the week as the 6th day. For the year you need to know if it is a leap year and depending on which century either add or subtract something by then I had lost interest because it seemed like a lot of facts you had to memorise to be able to do something which is in my opinion essentially a party trick.

  4. Karla says:

    The answer is “ask Siri”! I just looked it up, the calculation is very complicated, so didn’t show it. Not really a Hack!

  5. Joe Schmoe says:

    #2 doesn’t work, unless I’m missing something – I’m getting 9×9 is 82, obviously not correct

    • MC says:

      The fingers on the “top” have to be multiplied not added. So you get for 9×9 the 8 fingers from the touching ones down and above you have 1×1 -> 81.

    • Rou says:

      #2 is working. 1×1=1 (missing something!)

    • CM says:

      You have to multiple the number of fingers on the top, not add them. So for 9×9, you have to fingers above the touching fingers, using the formula that is 1×1 = 1. Then you count the number of fingers touching and below for the tens place which is 8, giving you 81.

    • tom says:

      9 x 9… You got that you add the eight fingers for the 80, then you added the 1 finger plus the 1 finger. You should have multiplied them 1 x 1 = 1. that would give you 81

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