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"Sum" usually implies that you add at least two numbers together; not just one. For completeness sake, you might thing of the "sum of a single number" as the number itself.

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The sum of 45 is always exactly 45.

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Q: What is the sum of 45?

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The sum of all integers between 45 and 90 is 3105.

if 9/10 =45, then the full sum is 50 (45/9x10) If you want to find 9/10, then it's (45/10x9) which is 40.5

45/(C + 17)

20+30+45 = 95

It is 9+36 = 45

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The sum of 45 and 246 is 291.

-45

1, 3, 5, 9, 15, 45 (sum = 78).

16 + 45 = 61

The sum of 30 and 45 is 75.

−45 + 17 = -28

It is: 45+13 = 58

45.

The sum of all integers between 45 and 90 is 3105.

60

The sum is 300+45 = 345

if 9/10 =45, then the full sum is 50 (45/9x10) If you want to find 9/10, then it's (45/10x9) which is 40.5