courses › Fractions, Decimals & Percents

Convert fractions to percents and take common percents of amounts.

Best in your head · no pen, no calculator why?

Learn first (about 3 minutes)

Opens at level 8.

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Builds on: Fraction basics (not open yet) · Decimals (not open yet)

skills · practice stats

From rounds of this course only: box, review and trial answers are left out. Once a skill has 40 tries, it compares your first 20 tries with your last 20.

• Percent to decimal par 4 s not tried yet

  worked example

  Write 5% as a decimal.

  Answer: 0.05

  1. Percent means per hundred: 5 ÷ 100 = 0.05.

• Fraction to percent par 4 s not tried yet

  worked example

  Write 0.9 as a percent.

  Answer: 90%

  1. Multiply by 100: 0.9 × 100 = 90, so 0.9 = 90%.

• 1%, 5%, 10% par 6 s not tried yet

  worked example

  What is 10% of 1,500?

  Answer: 150

  1. 10% is one tenth: 1,500 ÷ 10 = 150.

• Build a percent par 9 s not tried yet

  worked example

  What is 75% of 164?

  Answer: 123

  1. 75% is the whole minus one quarter: 164 − 41 = 123.

rest ladder

Win 3 of your last 4 rounds and the course rests. A win is 90% right, within 2× the round's par. Pass the review when it comes back and the next rest is longer.

1. 1 day
2. 3 days
3. 7 days
4. 14 days
5. 30 days
6. 60 days
7. mastered · every 90 days

your rounds

No rounds yet.