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Camden County College

Pre-Algebra: Lesson 058

Addition and Subtraction
Subtracting Decimals

Lesson Description

Students learn to subtract decimals by first lining up the decimal points, then subtracting the numbers by column. For example, to subtract 9.514 - 1.6, first line up the decimal points, then subtract the digits the thousandths column, to get 4 - 0, or 4, then subtract the digits in the hundredths column, to get 1 - 0, or 1, then subtract the digits in units column, by borrowing a 1 from the 9 in the units column (which leaves an 8 in the units column), to get 15 - 6, or 9, then subtract the digits in the units column, to get 8 - 1, or 7. So 9.514 - 1.6 = 7.914.

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