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If you mean 3/5 then they are 6/10 and 9/15
if you mean 9/10 + 3/5 then multiply 3/5's numerator and denominator to get 6/10, which you can add to 9/10 to get 15/10, or 3/2. 1 1/2 if you need mixed numbers.
9/10 - 3/5 = 9/10 - 6/10 = 3/10 or 3 over 10
3, 3, 5, 9, 10
If by "smaller than ten" you mean closer to zero than 10, then sum = -9 + -7 + ... + -1 + 1 + ... + 7 + 9 = 0 If you mean the numbers less than 10, then: sum = 9 + 7 + ... + 1 + -1 + -3 + ... = -∞ If you mean the counting numbers less than 10, then: sum = 1 + 3 + 5 + 7 + 9 = ½ × 5 × (1 + 9) = ½ × 5 × 10 = 25