Worked examples
Two examples
Example 1
3 + 4 × 5 =
- Multiply before adding: 4 × 5 = 20.
- Then 3 + 20.
Answer: 23
Example 2
20 − 8 + 3 =
- Adding and subtracting are on the same level, so go left to right.
- 20 − 8 = 12, then 12 + 3.
Answer: 15
Where this is taught: Quiz 6: Order of Operations, “The pyramid of precedence”
The drill
Ten problems
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.