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.
Square of 35
- Take the "tens" part of the number (the 3 and
add 1)=4
- Multiply the original "tens" part of the
number by the new number (3x4)
- Take the result (3x4=12) and put 25 behind it. Result
the answer 1225.
Square of 75
- Take the "tens" part of the number (the 7 and
add 1)=8
- Multiply the original "tens" part of the
number by the new number (7x8)
- Take the result (7x8=56) and put 25 behind it. Result
the answer 5625.