Question
Simplify each of the following:
109 × 107

Answer

109 × 107 = (100 + 9) × 107
= 100 × 107 + 9 × 107
= 100 × (100 + 7) + 9 × (100 + 7)
= 10000 + 700 + 900 + 63
= 11663

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