courses › Pre-Algebra

Brackets, powers, then × and ÷, then + and −.

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

Learn first (about 3 minutes)

Opens at level 11.

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Builds on: Negative numbers (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.

• × before + par 8 s not tried yet

  worked example

  9 + 11 × 7

  Answer: 86

  1. × and ÷ come before + and −: 11 × 7 = 77.
  2. Then 9 + 77 = 86.

• Brackets & powers par 12 s not tried yet

  worked example

  (4 + 4) × 8 − 6²

  Answer: 28

  1. Brackets first: 4 + 4 = 8.
  2. Power: 6² = 36.
  3. Multiply: 8 × 8 = 64.
  4. Then 64 − 36 = 28.

• Signs & powers par 8 s not tried yet

  worked example

  −4² − (−2)²

  Answer: -20

  1. −4² means −(4²) = −16.
  2. (−2)² = (−2) × (−2) = 4.
  3. Total: −16 − 4 = −20.

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.