Percents 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
Percent rules
- Percent means per hundred: 35% = 35/100 = 0.35.
- Percent to decimal: move the decimal point 2 places left (4.5% = 0.045). Decimal to percent: move it 2 places right.
- percent = part ÷ whole × 100. The whole always goes on the bottom.
- part = (percent ÷ 100) × whole. The part has the same units as the whole.
- Percent composition = mass of the element ÷ mass of the compound × 100. All the percents add up to about 100%.
- Percent yield = actual yield ÷ theoretical yield × 100.
- Atomic masses from the lesson: H = 1.01, C = 12.01, N = 14.01, O = 16.00. Questions give any others.
Practice for the Percents lesson in Quantitative Skills. Original ZornScience questions.
About this activity
Change percents to decimals and back, find a percent or a part of a whole, and work out percent composition and percent yield. Every set has new numbers.
Related lessons
- PercentsQuantitative Skills