Answer:
(i) 81 The unit digit of the square of the number 81 will be 1. | \[\because \,\,\,1\times 1=1\] (ii) 272 The unit digit of the square of the number 272 will be 4. I \[\because \,\,\,2\times 2=4\] (iii) 799 The unit digit of the square of the number 799 will be 1. I \[\because \,\,\,9\times 9=81\] (iv) 3853 The unit digit of the square of the number 3853 will be 9. I \[\because \,\,\,3\times 3=9\] (v) 1234 The unit digit of the square of the number 1234 will be 6. | \[\because \,\,\,4\times 4=16\] (vi) 26387 The unit digit of the square of the number 26387 will be 9. I \[\because \,\,\,7\times 7=49\] (vii) 52698 The unit digit of the square of the number 52698 will be 4. I \[\because \,\,\,8\times 8=64\] (viii) 99880 The unit digit of the square of the number 99880 will be 0. I \[\because \,\,\,0\times 0=0\] (ix) 12796 The unit digit of the square of the number 12796 will be 6. I \[\because \,\,\,6\times 6=36\] (x) 55555 The unit digit of the square of the number 55555 will be 5. I \[\because \,\,\,5\times 5=25\]
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