courses › Fractions, Decimals & Percents

Add, subtract, multiply, and divide fractions.

In your head, jot if needed · no calculator why?

Learn first (about 3 minutes)

Opens at level 12.

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Builds on: Fraction basics (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.

• Fraction of a number par 8 s not tried yet

  worked example

  What is 1/2 of 152?

  Answer: 76

  1. 1/2 of 152 is 152 ÷ 2 = 76.

• Add & subtract par 16 s not tried yet

  worked example

  8/9 − 5/6 Answer as a fraction in lowest terms.

  Answer: 1/18

  1. Use a common denominator of 18: 16/18 − 15/18 = 1/18.

• Multiply par 11 s not tried yet

  worked example

  3/4 × 4/5 Answer as a fraction in lowest terms.

  Answer: 3/5

  1. Multiply the tops and the bottoms: 3 × 4 = 12 and 4 × 5 = 20, so 12/20.
  2. Divide top and bottom by 4: 12 ÷ 4 = 3 and 20 ÷ 4 = 5, so 3/5. Cancelling first is faster.

• Divide par 13 s not tried yet

  worked example

  1/6 ÷ 5/6 Answer as a fraction in lowest terms.

  Answer: 1/5

  1. Dividing by 5/6 is multiplying by 6/5: 1/6 × 6/5 = 6/30, which simplifies to 1/5.

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.