What addition does this equation give you a quicker way to calculate? $$\frac{9(9+1)}{2}$$

Practice: Sums - Series of Integers M to N - Equation to Addition

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Sums - Series of Integers M to N - Equation to Addition

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Practice: Sums - Series of Integers M to N - Equation to Addition

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Sums - Series of Integers M to N - Equation to Addition

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