When

Example addition: (6 + 3) + 4 = 6 + (3 + 4)

Because 9 + 4 = 6 + 7 = 13

Also when

Example multiplication: (2 × 4) × 3 = 2 × (4 × 3)

Because 8 × 3 = 2 × 12 = 24

**adding**it doesn't matter how we group the numbers (i.e. which we calculate first).Example addition: (6 + 3) + 4 = 6 + (3 + 4)

Because 9 + 4 = 6 + 7 = 13

Also when

**multiplying**it doesn't matter how we group the numbers.Example multiplication: (2 × 4) × 3 = 2 × (4 × 3)

Because 8 × 3 = 2 × 12 = 24

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