MBA maths tricks

[pooja]

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I want to build my career in management line and for this preparing for MBA entrance examination searching for Math subject tricks. Will you please provide me list of some of the common and best MBA Entrance Exam preparation Maths Tricks so I prepare well?

[pawan]

Trick #1: When multiplying any 2 numbers whose unit digits add to 10 and the other digits are all same, the answer will be the (same number *same number+1) followed by multiplication of unit digits.

Eg1: 25 x 25= (2 x 3) (5 x 5)=625
Eg2: 37 x 33= (3 x 4) (7 x 3)=1221
Eg3: 114 x 116=(11 x 12) (4 x 6)=13224

Trick #2: When multiplying any number by 11, write down the largest digit of the number, sum all the digits in between(carry over if more than 10) and then write down unit digit
Eg1: 11 x 12= 1 (1+2) 2=132
Eg2: 11 x 158= 1 (1+5) (5+8) 8= 1738 [ here since 8+5=13, the 1 is carried over and added to 5+1 and therefore the sum in hundreds place becomes 7]

Trick #3: X% of Y= Y% of X
Eg1: 32% of 50= 50% of 32 =16
Eg2: 6% of 300 =300% of 6 =18

Trick#5: Square numbers 40-49:
Eg1: 48^2=?
Step 1: Subtract number from 50 (50-48=2)
Step 2: Subtract the difference found in step 1 from 25. This is the first digits of answer (25-2=23)
Step 3:Square the difference you found in step 1. If it's single digit, add 0 in front to make it double digit. This will be the last 2 digits of the square (2^2=4=04, dding the extra zero)
Final answer=2304

Eg 2: 42^2:
Step 1: 50-42=8
Step 2: 25-8=17
Step 3:8^2=64
Final answer=1764

Trick#6: Multiply by 99

Eg1: 7 x 99=?
Step 1: Multiply the number by 100 (Eg: 7 x 100=700)
Step 2: subtract the number from the value in step 1 to get final answer (700-7=693)

Eg2: 736 x 99
Step 1: 736 x 100=73600
step 2: 73600-736=72864
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Trick #7: Multiply any 2 numbers that end with 1

eg1: 71 x 61=?
Step 1: Multiply the tens digit numbers. These are the first digits of final answer (7 x 6=42)
Step 2: Add tens digit numbers. If sum is more than one digit, carry over to result from step 1. This is the next digit(7+6=13. Since 2 digits, 1 is carried over and added to 42 from previous step. )
Step 3: combine and add 1 at end to get final answer(43-3-1)
Final answer:71 x 61=4331

Eg2: 731 x 991=
Step 1: (73x99= 7300-73=7227)
Step 2: 73+99=172. Keeping digit 2 but carrying over 17 to previous step result(7227+17=7244)
Step 3: 724421 (combining adding adding 1)