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#1 Help Me ! » why does the 5 square trick work » 2006-01-29 15:25:54

justme
Replies: 9

When you want to square a number ending in a 5, you take the tens column and add one and multiply it to the original tens digit and place it in front of 25...  not a good description.

Try this 35 * 35  =

5*5 = 25
3*4 = 12
answer 1225

How does this work every time?

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