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# FRACTIONS - PowerPoint PPT Presentation

FRACTIONS. Adding and Subtracting Fractions. Fraction Review. A fraction is a numerical quantity that is not a whole number. A fraction consists of two parts, a numerator and a denominator . The top number is called the numerator. The bottom number is called the denominator. .

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### FRACTIONS

• A fraction is a numerical quantity that is not a whole number.

• A fraction consists of two parts, a numerator and a denominator.

• The top number is called the numerator. The bottom number is called the denominator.

• Animproper fraction is a fraction that has a numerator larger than or equal to its denominator.

• A mixednumberconsists of an integer followed by a proper fraction.

You can change an improper fraction to a mixed number, by dividing the numerator(7) by the denominator(5). This gives a quotient of 1 and a remainder of 2. The remainder is placed over the divisor (5).

To change a mixed number to an improper fraction, you “chicken beak,” or multiply the denominator(5) by the whole number(1) and then add the quotient(5) to the numerator(2). This gives 7, and it is placed over the original denominator of 5.

Adding fractions with like denominators

• To add two fractions with the same denominator, add the numerators and place that sum over the common denominator.

Adding fractions with unlike denominators

• To add two fractions with different denominators, find the Least Common Denominator (LCD) of the fractions.

• Rename the fractions to have the LCD. Add the numerators of the fractions. Simplify the fraction.

Let’s see you do it! Copy each problem on your personal dry erase boards. Girls, do the even problems, and boys do the odds! Circle your answers, and turn your board over so that I can come and check!

When subtractingfractions, you use the same method as when you add fractions, except you SUBTRACT. So, to subtract two fractions with the same denominator, subtract the numerators and place that sum over the common denominator. To subtract two fractions with different denominators, find the Least Common Denominator (LCD) of the fractions. Rename the fractions to have the LCD. Subtract the numerators of the fractions. Always simplify if needed.

Let’s see you do it! Copy each problem on your personal dry erase boards. Boys, do the even problems, and girls do the odds! Circle your answers, and turn your board over so that I can come and check!