Operations with metric units

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  1. Introduction to Operations with Metric Units
  2. Intro to adding metric units
  3. Adding Mixed Metric Units
  4. Subtracting mixed metric units
  1. Adding Mixed Metric Units
    1. 6cm 2mm + 12 cm 8mm
    2. 12 kg 150 g + 8 kg 90 g
    3. 3 L 20mL + 5 L
  2. Subtracting Mixed Customary Units
    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
    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?
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Topic Notes

In this lesson, we will learn:

  • Adding mixed metric units
  • Subtracting mixed metric units


Metric Units of Length:

1km = 1000 m
1 m = 100 cm
1 cm = 10 mm

Customary Units: Length, Volume, Weight

Metric Units of Volume

1L = 1000 mL

Customary Units: Length, Volume, Weight

Metric Units of Weight 

1kg = 1000 g

Customary Units: Length, Volume, Weight

-to add or subtract measurements – measurements must be in the SAME units

Adding Mixed Metric Units Steps
  1. Group together like units
  2. Add like units (starting with smaller units)
  3. Rename and Regroup units (if you need to)

Subtracting Metric Units Steps
  1. Group together like units
  2. Rename and regroup units (if you need to)
  3. Subtract like units