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In Mathematics / Middle School | 2014-11-15

What is the sum of the two digit multiples of 11?

Asked by cadieux

Answer (3)

S = 2 1 ​ n ( a + l )
a = 11 l = 99 n = 9
S = 2 1 ​ 9 ( 11 + 99 ) S = 2 1 ​ 9 ( 110 ) S = 2 990 ​ S = 495

Answered by superkoopasirf | 2024-06-10

11+22+33+44+55+66+77+88+99 33+77+121+165+99 110+286+99 396+99 495

Answered by awesome099 | 2024-06-10

The sum of the two-digit multiples of 11, which include 11, 22, 33, 44, 55, 66, 77, 88, and 99, is 495. This was calculated using the formula for the sum of an arithmetic series. There are a total of 9 terms in this sum.
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Answered by superkoopasirf | 2024-12-26

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