Excerpt from Essentials of Algebra: Complete Course (an Adequate Preparation for the College or Technical School) For Secondary Schools
Thus, to add 3, 6, 5, and 2; adding 6 to 3 gives 9; adding 5 to 9 gives 14; adding 2 to 14 gives 16, the sum.
From the foregoing it is evident that to find the sum in a series of additions we may proceed from left to right, uniting two numbers at a time.
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