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The sum of the first 10 multiples of 3 is 165.

Q: What is the sum of the first 10 multiples of 3?

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4 and 8 are multiples of 2. 6 and 9 are multiples of 3. 40 and 50 are multiples of 10.

Hiya, first 3 even multiples of 9 are: 18, 36, 54 -hope this helped.

10 + (-3) = 7 10 - (-3) = 13 10 and -3

hmm, 3,6,9,12,15 maybe

10 + 3x

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10+20+30 = 60

5 + 10+15+20=50 ans

975

Created in a spreadsheet, the answer is: 375750

Sum_ap = ½ × number_of_terms × (first_term + last_term) For the first 88 multiples of three: number_of_terms = 88 first_term = 1 × 3 = 3 last_term = 88 × 3 = 264 → Sum = ½ × 88 × (3 + 264) = 44 × 267 = 11748

4 + 8 + 12 = 24

The sum of all multiples of 3 below 500 is the sum of 3 + 6 + ... + 498 = 41583The sum of all multiples of 5 below 500 is the sum of 5 + 10 + ... + 495 = 24750Depending upon the interpretation of "of 3 and 5", the answer is one of:The sum of all multiples of both 3 and 5 below 500 is the sum of 15 + 30 + ... + 495 = 8415The sum of all multiples of 3 below 500 and all multiples of 5 below 500 is 41583 + 24750 = 66333Since the multiples of both 3 and 5 (that is 15, 30, ...) have been counted twice - once in the multiples of 3 and once in the multiples of 5 - the sum of all multiples of 3 or 5 or both below 500 is 41583 + 24750 - 8415 = 57918I have emphasised the word below with regard to 500 since 500 is a multiple of 5, but 500 is not below (less than) itself, that is the multiples are of the numbers 1, 2, 3, ..., 499. If the question was intended to mean less than or equal to 500, add an extra 500 to the multiples of 5 above, making the sum of the multiples of 5 be 25250 and the final sums (1) 8415, (2) 66833, (3) 58418.

The first 10 multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, 24, 27, and 30.

Sum of first 25 multiples of 44+8+12....100taking 4 common4(1+2+3+4....+25) = 4*325 =1300

10, 20, 30.

3

3+6+9...+45taking 3 common3(1+2+...+15) = 360