Amazing Tricks of Multiplication in Mathematics

1.    Finding the square of a number with the digit 5 at unit place.

45² = 2025

55²= 3025

First be clear that the last two digits of perfect square of the number of the number is always 25

Then multiply the remaining number with its consecutive number.

For eg:

i) 35² =1225, first make 5²=25 and nest consecutive number of 3 is 4. And 3×4=12

Hence 35² =1225.

ii)75² For this: (7+1) ×8=56 and 5²=25. Therefore 5625.

2.    Multiplying numbers in between 90 to 100.

96×95=9120

Tricks:   i)      Make three hundred

100 100 100

              ii)     Subtract 96 from 100 and 95 from another 100.

                       100-96 = 4 and 100-95 = 5

              iii)    Now add 4 and 5 then subtract from 100

                       100-(4+5) =91

              iv)     Multiply 4 and 5 i.e. 4×5=20

              v)      Now finally arrange: 96 ×95=9120

By: Prabesh Dhungana  Grade 8 A