First you add 1 + 5. To check your work, add up, 5 + 1.
If you have a column of numbers and you go down each column to add them together, that's normal, right?
To check to make sure you're right, you'd add from the bottom to the top of each column. If you get the same answer, you know it's right.
That's called adding up.
When my mother was working for her father in the family business (long before calculators or computers) and had to add long columns of numbers, adding down was the standard; then adding up was the double-check.
in the addition problems below each leter represents the same digit in both problems. Replace each letter with a different digi, 1-9, so that both addition problems are true.(there are two possible answers.) A B C A D G +D E F +B
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I need help adding fractions with different denominators. Here is the problem... 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem?
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