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Square a 2 Digit Number Ending in 5
For this example we will use 25
• Take the "tens" part of the number (the 2 and add 1)=3
• Multiply the original "tens" part of the number by the new number (2x3)
• Take the result (2x3=6) and put 25 behind it. Result the answer 625.
Try a few more 75 squared ... = 7x8=56 ... put 25 behind it is 5625.
55 squared = 5x6=30 ... put 25 behind it ... is 3025. Another easy one! Practice it on paper first!
SINGLE STEP: 35 square
(3x[3+1]) / (5x5) = 12 / 25 = 1225
Square 2 Digit Number: UP-DOWN Method