Evaluate:
(i) 69 × 71 (ii) 94 × 106.
(i) We have
69 × 71 = (70 – 1) × (70 + 1)
= (702 – 12)
= 4900 – 1
= 4899
(ii) We have
94 × 106 = (100 – 6) × (100 + 6)
= (1002 – 62)
= 10000 – 36
= 9964