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# Lesson 8 2 proportions

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### Lesson 8 2 proportions

1. 1. Name ____________________________________ Date __________________Mrs. Labuski / Mrs. Rooney Period __________ Lesson 8-2 Proportions VOCABULARY DEFINITION EXAMPLE PROPORTIONFirst write the ratio of triangles to circles: Number of triangles = Number of circles =Next separate the triangles and the circles into two equal groups:Now write the ratio of triangles to circles in each group: Number of triangles in each group = Number of circles in each group =A proportion is shown by the models is =You can use Cross Products to complete proportions.Find the missing value in the proportion 3 = n 4 16The cross products are equal. 3= n 4 16 4 n = 316 4n = n=
2. 2. Name ____________________________________ Date __________________Mrs. Labuski / Mrs. Rooney Period __________ Lesson 8-2 Proportions VOCABULARY DEFINITION EXAMPLE An equation that shows 4=8 PROPORTION two equivalent ratios. 2 4First write the ratio of triangles to circles: Number of triangles = Number of circles =Next separate the triangles and the circles into two equal groups:Now write the ratio of triangles to circles in each group: Number of triangles in each group = Number of circles in each group =A proportion is shown by the models is =You can use Cross Products to complete proportions.Find the missing value in the proportion 3 = n 4 16The cross products are equal. 3= n 4 16 4 n = 316 4n = n=
3. 3. 8n = 48 4n = 180 6n = 180 ÷8 ÷8 ÷4 ÷4 ÷6 ÷6 n=6 n = 45 n = 30 10n = 20 3n = 18 3n = 42 ÷10 ÷10 ÷3 ÷3 ÷3 ÷3 n=2 n=6 n = 143n = 30 9n = 36 2n = 130÷3 ÷3 ÷9 ÷9 ÷2 ÷2 n = 15 n=4 n = 65
4. 4. money 1.25 = x miles 0.5 3 0.5x = 3 x 1.25 0.5x = 3.75 ÷0.5 ÷0.5 x = 7.50Practice 20 = xLessons 5 20 5x = 400 ÷0.5 ÷0.5 c = 80
5. 5. p. 400#6-19 p. 401 #26