find the square of 276 using diagonal method
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276✅⬇️
1) Add each diagonal from bottom to top [Add the carry to next diagonal]
6 = 6
2 + 3 + 2 = 7
2 + 4 + 9 + 4 + 2 = 21 = 1 [take 2 to next diagonal]
1 + 4 +4 + 4 + 1 + (2) = 16 = 6 [take 1 to next diagonal]
1 + 4 + 1+ (1) = 7
0 = 0
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