Question

Evaluate:
(i) 69 × 71
(ii) 94 × 106

Answer 1

(i) $69\times 71=\left(70-1\right)\times \left(70+1\right)=\left({70}^2-1^2\right)=4900-1=4899$

(ii) $94\times 106=\left(100-6\right)\times \left(100+6\right)=\left({100}^2-6^2\right)=10000-36=9964$