Ratios and Proportions Practice
Quantitative Skills · Ratios and Percents
New numbers every set.
Choose one skill for 8 questions, or Mixed review for 12. Every set has new numbers.
No timer. Use scratch paper and a calculator. The rules from the lesson are below.
Your set is complete
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Reference
Ratio and proportion rules
- Write a ratio as 3 : 2, 3 to 2, or 3/2. The first quantity named goes first.
- Simplify by dividing both numbers by the same factor: 12 : 8 = 3 : 2.
- Change to the same units first: 50 cm : 2 m = 50 cm : 200 cm = 1 : 4.
- In a balanced equation, the coefficients give the mole ratio: 2 H2 + O2 → 2 H2O (H2 : O2 = 2 : 1)
- A proportion is two equal ratios. Keep the same units in the same spots and use x for the unknown: 120 km / 2 h = x km / 5 h
- Cross-multiply, then divide: 2 · x = 120 · 5 = 600, x = 600 ÷ 2 = 300 km
Practice for the Ratios and Proportions lesson in Quantitative Skills. Original ZornScience questions.
About this activity
Write ratios in order and in simplest form, solve proportions for maps, solutions, speeds and springs, and use mole ratios from balanced equations. Every set has new numbers.
Related lessons
- Ratios and ProportionsQuantitative Skills
- Mole RatiosChemistry