It doesn't matter how we group the numbers (i.e. which we calculate first)

• when we **add**:

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

Because 9 + 4 = 6 + 7 = 13

• or when we **multiply**:

Example: (2 × 4) × 3 = 2 × (4 × 3)

Because 8 × 3 = 2 × 12 = 24