I'm guessing that is:
(70 000 000)² = (7×10^7)^2 = (7×10^7) × (7×10^7) = (7×7)×(10^7 × 10^7) = (7×7)×10^(7+7) = 49×10^14 = 4 900 000 000 000 000
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Seventy million two.
70 000 000 is the same as 70 000 thousands
It is seventy trillion =70,000,000,000,000
70% of 510,000 = 70% * 510,000 = 0.7 * 510,000 = 357,000
70,000,000,000 is written as: seventy billion.