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Numerical Expressions: Order of Operations

Mathematics Grade 3 Difficulty 2/5

Beginning of the lesson

Understanding Order of Operations

The Special Rules

When we see a problem like 5 + 3 × 2, we need to know which operation to do first!

Remember the Order of Operations Rules

Parentheses BEFORE everything else!
If parentheses are nested, solve from inside out.
Step 0( )Step 1× and ÷Step 2+ and −ThenFirstAlways work from LEFT to RIGHT at each level!

Expressions with Parentheses: Parentheses First

Parentheses show that these operations need to be done first. If there are nested parentheses, solve from inside out: first the inner \(( \ )\), then the outer ones. After parentheses, continue with the regular order: \(\times\) and \(\div\) before \(+\) and \(-\), all from left to right.

Good to know: Sometimes for convenience with nesting, square brackets \([ \ ]\) and curly braces \(\{ \ \}\) are used: they work the same as round parentheses.
Same numbers — different answers:
Without parentheses:

\(5 + 3 \times 2\)

Multiplication first: \(3 \times 2 = 6\)

Then addition: \(5 + 6 = 11\)

Answer: \(11\)

With parentheses:

\((5 + 3) \times 2\)

Parentheses first: \(5 + 3 = 8\)

Then multiplication: \(8 \times 2 = 16\)

Answer: \(16\)

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In the full lesson

  • The complete explanation
  • Worked examples
  • Common mistakes and how to avoid them
  • Test questions: 15
  • AI tutor that answers questions about the topic
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