500000000 x 798000000 = 399,000,000,000,000,000
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5 x 108
5 x 108
900 + 500000000 = 500000900
It would be a "D" with two vinculums or bars on top.
500 million = 500,000,000 or 5 x 10^8 It can also be called half a billion.