Compare and Order Rational Numbers 0011 0010 1010 1101 0001 0100 1011 7th Grade Math 1 2 4 Lesson Objective: Students will compare and order fractions and decimals. Vocabulary 0011 0010 1010 1101 0001 0100 1011 • Rational Number – Any number that can be written as a fraction – Examples: whole numbers, integers, fractions, decimals and percents 1 2 4 Compare Rational Numbers 0011 0010 1010 1101 0001 0100 1011 • Use <, >, or = to make the statement true. 1 -5 __ < 3 -5 0 -4 __ > -6 3 -6 2 4 -4 0 Compare Rational Numbers 0011 0010 1010 1101 0001 0100 1011 • Use <, >, or = to make the statement true. 1 0 ¼ ¾ 2 < -1 1/6 -1 5/6 __ ¾ __ > ¼ 1 -2-15/6 4 -11/6 -1 Whiteboard Practice 0011 0010 1010 1101 0001 0100 1011 • Use <, >, or = to make the statement true. 3 4 __ 5 5 4 7 __ 9 9 5 1 7 __ 7 8 8 3 6 1 __ 1 4 8 1 2 4 Least Common Multiple 0011 0010 1010 1101 0001 0100 1011 • If the fractions are unlike, find a common denominator to compare them. 7 8 __ 12 18 12 x 1 = 12 12 x 2 = 24 12 x 3 = 36 1 2 4 18 x 1 = 18 18 x 2 = 36 Compare Rational Numbers 0011 0010 1010 1101 0001 0100 1011 • Use <, >, or = to make the statement true. 7 8 __ 12 18 7 x3 8x2 __ 12 x 3 18 x 2 21 > 16 7 8 so > __ __ 36 36 12 18 1 2 4 Whiteboard Practice 0011 0010 1010 1101 0001 0100 1011 • Use <, >, or = to make the statement true. 7 2 __ 10 3 2 4 3 __ 3 3 6 3 2 2 __ 2 4 3 11 7 3 __ 3 16 8 1 2 4 Real World Example 0011 0010 1010 1101 0001 0100 1011 • In Mr. Huang’s math class, 6 out of 32 students own roller shoes. In Mrs. Trevino’s math class, 5 out of 29 students own roller shoes. In which class does a greater fraction of students own roller shoes? 1 Mr. Huang 6 ÷ 32 = 0.1875 2 4 Mrs. Trevino 5 ÷ 29 = 0.1724 Whiteboard Practice 0011 0010 1010 1101 0001 0100 1011 • The table shows hoe much copper is in each type of coin. Which coin contains the greatest amount of copper? Coin Amount of Copper Dime 12/16 Nickel 3/4 Penny Quarter 1 2 4 1/400 23/25 Whiteboard Practice 0011 0010 1010 1101 0001 0100 1011 • Gracia and Jim were shooting free throws. Gracia made 4 out of 15 free throws. Jim missed 6 out of 16 free throws. Who made the free throw a greater fraction of the time? 1 2 4 Ordering Rational Numbers 0011 0010 1010 1101 0001 0100 1011 • List the numbers 3.44, π, 3.14, and 3.4 in order from least to greatest. 1. Write all numbers to the same place value. 3.440 , 3.141, 3.140, 3.444 2. Order the numbers according to directions. 1 3.140 3.141 3.440 or 3.14 , π, 3.44, 3.4 2 4 3.444 Whiteboard Practice 0011 0010 1010 1101 0001 0100 1011 • Order each set of numbers from least to greatest. 1 2 0.23, 0.19, 1/5 -0.615, -5/8, -0.62 8/ , 10 -1.4, -11/25, -1.25 0.81, 0.805 4