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Notes Ratios A __________________ is a comparison of two numbers. A ratio may be written in THREE ways: as a _____________________________ ( 7 10 ) using a ____________________________ (7:10) in ___________________________ (7 to 10) **Simplify ratios, but DO NOT change improper fractions into mixed numbers. Find the ratio of teachers to students in the classroom. Find the ratio of males to females in the classroom Find the ratio of males to the total number of students in the room. Comparing Ratios To determine if two ratios are equivalent (equal), cross multiply. If the products are the same, they ratios are equivalent! 1 12 12 32 3 7 4 9 2 24 15 40 4 12 5 11 Determine if the following ratios are equivalent. 1) 2 3 and 12 20 2) 12: 84 and 24: 168 3) 3 15 and 4 20