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Q: What two numbers multiplies to 100 and adds up to twentynine?

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105

2468101214161820222426283032343638404244464850525456586062646866707274767880828486889092949698100

20, 40, 60, 80, 100 and so on.

We're not quite sure what the "2 digit numbers of 100" are.Do you mean all the "2-digit numbers you say as you count to 100" ?If that's it, then here's how to sum them:There are 100 of them, minus (1 through 9, and 100) = 100 - 10 numbers = 90 numbers.Make pairs of them . . .10 + 99 = 10911 + 98 = 10912 + 97 = 10913 + 96 = 10914 + 95 = 109..etc.There are 45 pairs, and every pair adds to 109.So the sum of all 90 numbers is (45 x 109) = 4,905.

There are 100 numbers.

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10. As in 10 + 10 = 20 and 10 * 10 = 100.

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105