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15X15=? 25X25=? 35X35=? 45X45=? 55x55=? 65X65=? ... 95x95=? who can tell me how to do these multiplications without a calculator in 30 seconds ? tell me the details
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15X15=?

25X25=?
35X35=?
45X45=?
55x55=?
65X65=?
...
95x95=?
who can tell me how to do these multiplications without a calculator in 30 seconds ?
tell me the details

User Alex Spencer
by
4.4k points

1 Answer

7 votes
5x5 =25 plus whatever number before the 5 in the equation is added to 25. 15x15= 5x5=25 plus 2 (move to hundredths place) = 225. 25x25 = 5x5=25 plus 4 (move to hundredths place) = 625
User Valsaraj Viswanathan
by
4.3k points
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