4 * 10-7 = 4 * 0.0000001 = 0.0000004
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4 billion/10 million = 4 x 109 / 10 x 106 = 4 x 109 / 107 = 4 x 102 = 400
42.62 x 107 = 4560.34
-89,200,000 = -8.92 x 107 or 8.92 x -107
77,040 because 107 x 2 = 214 214 x 3 = 642 642 x 4 = 2568 2568 x 5 = 12840 12840 x 6 = 77040
20% of 107 = 0.2 x 107 = 21.4