We convert units and add or subtract measurements.
To change a bigger unit to a smaller one, multiply: 3 m = 3 × 100 = 300 cm; 2 kg = 2 × 1000 = 2000 g. We can also add or subtract: 1 kg − 300 g = 1000 g − 300 g = 700 g.
Remember
- 1000 g = 1 kg · 1000 mL = 1 L · 100 cm = 1 m.
- Same units before you add or subtract.