Most Asked Easy Math Tricks
1. Addition
567 + 432 = 567 + (400 + 30 + 2) = 967 + 30 + 2 = 997 + 2 =
999
The first trick is to simplify your problem by breaking it into smaller pieces. For example, we can rewrite
2. Subtraction
721–387 # the complement of 87 is 13, so we can swap 387 with 400 – 13 -> 721 — (400 - 13) = 321 - -13 = 321 + 13 =
334
Using the complement of a number can help make subtraction easier.
3. Elevens
35 x 11 -> 3
_
5 -> 3+5 = 8 -> 3
8
5
For a two-digit number, add the digits and put the answer in the middle of the number you are multiplying:
4. Nines
799 x 9 = 799 x (10 -1) = 7990 – 799 =
7191
Multiplying by nines can be simplified by multiplying by 10 and subtracting the original number.
5. How to solve squares
65^2 = (60 x 70) + 5^2 = 4200 + 25 =
4225
You can re-write a square equation into numbers that are easier to deal with using this formula.
6. Close together method
47 x 43 = (40 + 7)(40 + 3) = 40 x (40 + 3 + 7) + (7 x 3) = (40 x 50) + (7 x 3) = 2000 + 21 =
2021
The formula works for all numbers, but it doesn’t simplify well unless the numbers are similar.
7. Simplify Calculations
898 / 4 = 449 / 2 = 224 and ½
You can simplify some equations before you even start. For example, divide both the divisor and dividend by two.
8. Reverse the question
What’s 36% of 25 -> is the same as 25% of 36 -> 25% is ¼ -> 36/4 = 9 36% of 25 is
9
Percentages are associative, so sometimes reversing the question’s order makes it easier to calculate.
List of top cool math tricks
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