Explanation:
5,200,000 = 5.2 × 10⁶
so, we have
(5.2 × 10⁶) × (8.3 × 10²) - (3.1 × 10⁸)
(5.2 × 8.3 × 10⁸) - (3.1 × 10⁸)
(43.16 × 10⁸) - (3.1 × 10⁸) = 40.06 × 10⁸ = 4.006 × 10⁹
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