Question:
305 × 308 = ?
(a) 94940
(b) 93840
(c) 93940
(d) 94840
Solution:
(c) 93940
$305 \times 308=(300+5) \times(300+8)$
$=(300)^{2}+300 \times(5+8)+5 \times 8$
$=90000+3900+40$
$=93940$
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