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
(i) ∵ 1 × 1 = 1
∴ The unit’s digit of (81 )2 will be 1.
(ii) ∵ 2 × 2 = 4
∴ The unit’s digits of (272)2 will be 4.
(iii) Since, 9 × 9 = 81
∴ The unit’s digit of (799)2 will be 1.
(iv) Since, 3 × 3 = 9
∴ The unit’s digit of (3853)2 will be 9.
(v) Since, 4 × 4= 16
∴ The unit’s digit of (1234)2 will be 6.
(vi) Since 7 × 7 = 49
∴ The unit’s digit of (26387)2 will be 9.
(vii) Since, 8 × 8 = 64
∴ The unit’s digit of (52698)2 will be 4.
(viii) Since 0 × 0 = 0
∴ The unit’s digit of (99880)2 will be 0.
(ix) Since 6 x 6 = 36
∴ The unit’s digit of (12796)2 will be 6.
(x) Since, 5 x 5 = 25
∴ The unit’s digit of (55555)2 will be 5.
