Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Fractions Let’s practice! Get the white boards. Parts of the fraction. • What is the top number of a 2. fraction called? 3 • The top number in a fraction is called the numerator. • What does the numerator tell you? • The numerator tells you how many parts or pieces you have. 1 2 • What is the bottom number of a 2. fraction called? 3 • The bottom number in a fraction is called the denominator. • What does the denominator tell you? • The denominator tells you how many parts or pieces make one whole. 1 2 3 Use your whiteboard • How many pieces make one whole? • How many pieces are blue? 3 • What fraction is shaded blue? 3. 4. 4 Use your whiteboard What fraction is shaded blue? 2. 5. Use your whiteboard What fraction is shaded blue? How about now? 2. 8. 1. 4. Use your whiteboard What fraction is shaded blue? How about now? How about now? 2. 6. 2. 6. 1. 3. Use your whiteboard What fraction is shaded blue? How about now? How about now? 2. 2. 8. 8. 1. 4. Use your whiteboard What fraction is shaded blue? 2. 5. 4. 10 6. 15 • What is 2/5 of 5? • What is 2/5 of 10? • What is 2/5 of 15? 2 4 6 Mixed Numbers • What is a mixed number? • A combination of a whole number plus a fraction. 1 whole ¾ 1¾ Mixed Numbers • Any whole number can be written as a fraction by putting the whole number in the numerator and making the denominator 1. • Examples: • 3 = 3/1 5 = 5/1 56 = 56/1 Mixed Numbers • We know that when we multiply the numerator and denominator of a fraction both by the same number it doesn’t change the value. • Examples: • ½ x 3/3 = 3/6 • 2/3 x 4/4 = 8/12 Mixed numbers • If you have a whole number, you can do the same thing. • 2/1 x 3/3 = 6/3 Mixed numbers • If you have a mixed number like 21/3 try this: • 2/1 x 3/3 = 6/3 + 1/ 3 7/ 3 Mixed numbers • When changing a mixed number into an improper fraction, you want all the pieces to be the same size. That is why you multiply the whole number by the denominator over itself. • 34/5 = 3/1(5/5) + 4/5 = 15/5 + 4/5 = 19/5 Mixed Numbers Write the mixed numbers as improper fractions: • 3½ • 5 2/3 • 2 3/5 (3 x 2) + 1 2 (5 x 3) + 2 3 . = = . 2