Editing Subtraction (section)

===Partial differences===
The partial differences method is different from other vertical subtraction methods because no borrowing or carrying takes place. In their place, one places plus or minus signs depending on whether the minuend is greater or smaller than the subtrahend. The sum of the partial differences is the total difference.<ref>[http://ouronlineschools.org/Schools/NC/Demoschool/4thGrade/Math/PartialDifferences.htm Partial-Differences Subtraction] {{Webarchive|url=https://web.archive.org/web/20140623021239/http://ouronlineschools.org/Schools/NC/Demoschool/4thGrade/Math/PartialDifferences.htm |date=2014-06-23 }}; [https://sites.google.com/a/oswego308.org/msimester/home/math/algorithms/subtraction The Many Ways of Arithmetic in UCSMP Everyday Mathematics] {{Webarchive|url=https://web.archive.org/web/20140225135251/https://sites.google.com/a/oswego308.org/msimester/home/math/algorithms/subtraction |date=2014-02-25 }} Subtraction: Partial Differences</ref>

Example:
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File:Partial-Differences Subtraction Step 1.JPG|The smaller number is subtracted from the greater:<br>700 − 400 = 300<br>Because the minuend is greater than the subtrahend, this difference has a plus sign.
File:Partial-Differences Subtraction Step 2.JPG|The smaller number is subtracted from the greater:<br>90 − 50 = 40<br>Because the minuend is smaller than the subtrahend, this difference has a minus sign.
File:Partial-Differences Subtraction Step 3.JPG|The smaller number is subtracted from the greater:<br>3 − 1 = 2<br>Because the minuend is greater than the subtrahend, this difference has a plus sign.
File:Partial-Differences Subtraction Step 4.JPG|+300 − 40 + 2 = 262
</gallery>