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Column addition lines the numbers up by place value and adds each column from the right, carrying any excess into the next column. The number of digits in the widest term tells you how many columns you need.
Column addition
total = Σ of all terms, adding units, then tens, then hundreds, carrying as needed
3590. The units column gives 7+5+8+0 = 20, so 0 with 2 carried.
Because place value is anchored at the units digit; aligning left would add tens to units.