Here is mathematical trick to multiply any two number whose difference is 2. Shortcut tricks are very helpful for fast
calculations in competitive exams as time allotted
is too less for lengthy calculations. So shortcut tricks helps us to
solve questions is very less time hence improving chances of getting
good score and higher rank in merit.
Multiplying Any Two Numbers Whose Difference is 2
Follow steps below:
- Find the number midway between two numbers. (Eg. 24 * 26. Number midway between 24 and 26 is 25).
- Square this number. (25 * 25 = 625)
- Now subtract 1 and this is your answer. (625 -1 = 624, 24 * 26 = 624)
Eg. 1:
61 *59
Step -1 => Number between 61 and 59 is 60.
Step -2 => 60 * 60 = 3600.
Step -3 => 3600 - 1 = 3599
Hence 61 * 59 = 3599. (Ans)
Eg. 2:
41 *43
Step -1 => Number between 41 and 43 is 42.
Step -2 => 42 * 42 = 1764
Step -3 => 1764 - 1 = 1763
Hence 41 * 43 = 1763. (Ans)
Try it yourself:
- 14 * 16 =
- 22 * 24 =
- 54 * 56 =
- 81 * 79 =
- 101 * 99 =
Mathematics is all about practice. Practice more and more problems of this type to improve your speed.
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