question_answer 1)

                What will be the unit digit of the squares of the following numbers? (i) 81                                      (ii) 272                                   (iii) 799                                  (iv) 3853 (v) 1234                                (vi) 26387                             (vii) 52698                            (viii) 99880 (ix) 12796                             (x) 55555.

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 \[\because \,\,\,5\times 5=25\]