Operations with metric system

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Intros
Lessons
  1. Intro to adding metric units
  2. Adding Mixed Metric Units
  3. Subtracting mixed metric units
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Examples
Lessons
  1. Adding Mixed Metric Units
    Add:
    1. 6cm 2mm + 12 cm 8mm
    2. 12 kg 150 g + 8 kg 90 g
    3. 3 L 20mL + 5 L
  2. Subtracting Mixed Metric Units
    Subtract:
    1. 12 L 20 mL - 3 L
    2. 8 m 34 cm - 3 m 21 cm
    3. 2 kg - 1000g
  3. Operations with metric units: Word problems
    Subtract:
    1. Sam drove for 12 km 9 m and then took a break. After his break he drove 8 km 2m. How far in total did he drive?
    2. Adam has an 8kg 20g bag of soil to use in his garden. If he uses 3 kg in the front garden and 2 kg 18 g in the back garden, how much soil does he have left?