Addition and Subtraction of Rational Numbers

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Addition and Subtraction of Rational Numbers
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Rational Numbers

•  

Number As a Fraction Rational?
5
1.75
.001
-2
3
Adding and Subtracting Rational Numbers

• Adding and Subtracting Rational Numbers may
  require you to combine numbers that are integers,
  decimals, and fractions. You may need to convert
  to the same form.
• Use integer add and subtract rules when needed.
• When you add or subtract fractions you must have
  a common denominator.
• To add and subtract decimals, be sure the decimal
  points are lined up so that the place-values are
  also lined up.

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Find the sum.1) -2.304 (-0.26)

• Line up the decimals and use integer add (same
  signs) rule.
• -2.564

Get a common denominator use integer add
(different signs) rule (subtract, take the sign
of the greater value.
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Find the difference.
3)
Change subtraction to adding the opposite.
Get a common denominator.
Subtract and keep sign of the larger number.
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Find the difference.
Change subtraction to adding the opposite.
Get a common denominator and subtract. Take sign
of greater value.
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Change to the same form first Then add
using integer add rules for different signs
(subtract, take sign of greater)
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Extra Practice Do each problem below on the back
of the rational number chart. Work with a peer
use your notes.