Evaluate: (i) 69 × 71

Question:

Evaluate:

(i) 69 × 71

(ii) 94 × 106

Solution:

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

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

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Kandis Pugh
Feb. 8, 2023, 1:32 p.m.
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