7*104 + 4*103 + 2*102 + 7*101 + 1*100
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419,854,000
640 written in expanded form using exponents is (6 x 10^2) + (4 x 10^1) + (0 x 10^0)
7 x 10^4 + 4 x 10^3 + 2 x 10^2 + 7 x 10^1 + 1 x 10^0
9,000,000 in expanded form using exponents is (9 x 106) + (0 x 105) + (0 x 104) + (0 x 103) + (0 x 102) + (0 x 101) + (0 x 100)
7049 = 7*19*53