4*1010 = 40 000 000 000
Forty billion.
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10 to the 4 power times 10 to the 3 power is 10,000,000 (10 million).
(4 x 10 )3 = 64,000 4 x 103 = 4000. It depends if the question is 4 times -----10 to the third power or 4 times ten ----- to the third power.
the answer is 300
One tenth of four = 1/10 * 4 = 4/10 = 2/5 = 0.4
4 x 10-5 = 0.00004