• Sludgeyy@lemmy.world
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    1 year ago

    Easy way to do %

    Say you want 6% of 45

    Seems hard right?

    1% of 45 is .45

    .45 × 6 =

    .4 × 6 = 2.4

    .05 × 6 = .3

    2.4 + .3 = 2.7

    So 6% of 45 is 2.7

    Extra:

    Say you want an item that is 40 dollars and it is 20% off.

    10% is 4 dollars.

    20% is 8 dollars.

    So item would be 32 dollars.

    • plz1@lemmy.world
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      1 year ago

      that’s a shitload of lines of math to write out/work in your head. I learned percentages of x as: 6 * 45 / 100 = x (2.7) If you picture both as fractions, you multiply the opposite and then divide by the other number to get the missing one (x). Hopefully Lemmy renders this well…

      6 x
      100 45

      The way I learned it was multiply diagonally and then divide by whatever is opposite diagonally to x.