Here is mathematical trick to multiply any number with 9. 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 Number With 9
Follow steps below:
- Insert a separator (/) before the last digit of the number. (eg. write 126 as 12 / 6 ).
- Now add 1 to the number before separator. (12+1 = 13).
- Subtract it from original number. (126 - 13 = 113). This is your left hand side of answer.
- Now subtract last digit of number from 10 and this is your right hand side of answer. (10 - 6 = 4)
- Append RHS and LHS. This is your answer (1134)
Follow examples below to understand it better:
Eg. 1:
35 * 9
Step -1 => 3 / 5
Step -2 => 3 + 1 = 4
Step -3 => 35 - 4 = 31
Step -4 => 10 - 5= 5
Step -5 => 315 (Ans)
Eg. 2:
253 * 9
Step -1 => 25 / 3
Step -2 => 25 + 1 = 26
Step -3 => 253 - 26 = 227
Step -4 => 10 - 3= 7
Step -5 => 2277 (Ans)
Try it yourself:
- 87 * 9 =
- 165 * 9 =
- 53 * 9 =
- 98 * 9 =
- 534 * 9 =
Mathematics is all about practice. Practice more and more problems of this type to improve your speed.
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