Speed Maths Tricks For Competitive Exams

Tricks For Speed Maths :

Ex 1 : Finding Square of a Number Ends With digit '5'
                     Lets find the square of 75
                     Sol: multiply unit place value with 5.
                         5 x 5 =25.
                     Take this value in right side,
                      i.e __25.
                    Now Multiply tens place value with next higher digit.
                       i.e 7 x 8=56.
                    now the result is 5625



Ex 2: Fast Multiplication of 2 digit numbers which have same digit in 10s place

                 Calculate 53 X 57
                 using the same theory ,The answer is 3021
               

Ex 3: Multiplication with 11 for 2 digit number.
                    42 X 11
                    Answer is 462
sol:              4+2=6,
                  Place this result in between those to digits.
                  i.e 4 6 2
                  4(4+2)2.