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- Find each missing value in equal ratios using a whole scaling number.6 : 5 = 42 : \,?9 : 4 = \,? : 288 : 56 = 6 : \,?36 : 27 = 4 : \,?3 : 24 = 11 : \,?
- Find each missing value by going through a friendlier ratio.6 : 10 = 9 : \,?8 : 6 = \,? : 910 : 7 = 15 : \,?9 : 12 = \,? : 106 : 4 = \,? : 14
- Word problem: activator spoonfuls needed for 27 bottles of glue.
- Word problem: how many players for 7 coaches.
- Word problem: how many meters of wire for 10 robots.
- Word problem: how many adults must go with 50 students.
- Explain Omar's mistake in solving a missing value by subtracting.
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Finding a missing value in a pair of equal ratios: the lesson ›More Chapter 4 worksheets: Ratios
- 4.1What a ratio is: language and notation
- 4.2Part-to-part and part-to-whole ratios
- 4.3Scaling a ratio up or down
- 4.4Finding a missing value in a pair of equal ratios
- 4.5Ratio tables
- 4.6The double number line
- 4.7Tape diagrams and sharing in a ratio
- 4.8Deciding which of two ratios is larger