Multiplication Tricks - Find solution within 20 seconds

Today I am going to share quick multiplication tricks that will help you find the solution within 20 seconds. Must read - 10 Coolest Maths tricks

Multiply by 9,99,999,etc...

56*99=5544

Step 1:Place a zero at the end for each 9 :5600

Step 2 : Subtract the original number from Step 1 like this 5600-56=5544

Multiply by 125

68*125=8500

Step 1 :Place three zeros at the end of the number :68000

Step 2: Divide the number from Step 1  by 8:68000/8=8500

64*125 is the same as :

32*250 is the same as

16*500 is the same as 

8*1000

64*125

Step 1. Each time you just need to pick 125 multiply it by 8 will get 1000

Step 2. Pick 64 and divide it by 8 will get 8

Step 3. Multiply the results with each other 8* 1000 

Hence Solution is 8000

[Hint: Just remember 125*8=1000]

Multiply two digits numbers ending in 1

51*31=1581

Step 1: Multiply the left most digits : 5*3=15

Step 2: Add the left most digits:5+3=8

Step 3: Places the result from Step 2 next to the result from Step 1:158

Step 4 : Places 1 next to the result from  Step 3 : 1581

Multiply numbers between 11 and 19

14*18=252

Step 1: Add the larger  number to the right most digit of the other number:18+4=22

Step 2: Put a 0 at the end of the result from step 1:220

Step 3 :Multiply the right most digits of both original numbers : 8*4=32

Step 4:Add Step 2 and step 3 :220+32=252

Multiply two digit number by 11

53*11=583

Step 1: Add the both digts of the two digit number:5+3=8

Step 2: Place the result in between both digits : 583

59*11=649

Step 1: 5+9=14

Step 2 : Carry the 1 when the result is greater than 9:5+1=6

Step 3: 649

Multiply by 5

 12345 *5 =6170

Step 1 : Divide  the number by 2 :1234/2=617

Step 2: Multiply  the result from Step 1 by 10 : 617*10=6170

Multiply by 25

 18*25=450
Step 1: Divide  the number by 4:18/4
Step 2: Multiply  the number from Step 1 by 100: 4.5 * 100 = 450

Multiply by 9

56*9=504

Step 1: Multiply the number by 10: 56*10=560

Step 2: Subtract the original number from Step 1: 560-56=504

Factorization

By Factoring number,you can break down problems into simpler multiplication tasks.Also,you may be able to apply some techniques you learned.

21*33

step 1 : 21*11*3

Step 2: 231*3

Step 3 :693

67*81

Step 1: 67*9*9

Step 2:603*9=5427

28*125=3500

Step 1: 28*125

Step 2: 28*25*5

Step 3:28*(100/4)*5

Step 4:28/4*100*5

Step 5:7*500=3500

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