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Grade 4 · Maths · Lessons
Measuring problems
⚖️mass🥤volume🛣️distance🔄same unit
Measuring problems.
The big ideaChange to one unit first. Then add, take away, multiply or share.

How it works

Change to one unit first. Then add, take away, multiply or share.

2 liters and 650 milliliters: change 2 liters to 2000 milliliters.

Say the unit in your answer.

Liters• 1 L = 1000 mL• 2 L = 2000 mLKilometers• 1 km = 1000 m• 4 km = 4000 m
Change the units.

Example 1: Times

  1. On Leo's trip, each box weighs 5 kilograms. He carries 2 boxes. How many kilograms in all?
  2. 2 boxes, each 5 kilograms.
  3. 2 × 5 = 10.
  4. So the answer is 10.

Example 2: Mixed units

  1. At Mia's camp, she pours 2 liters and 650 milliliters of juice. Then she pours 950 milliliters more. How many milliliters in all?
  2. 2 liters is 2000 milliliters.
  3. 2000 + 650 + 950 = 3600.
  4. So the answer is 3600.

Example 3: A fraction of a unit

  1. On Omar's farm, the path is 4 kilometers long. He has walked half a kilometer. How many meters are left?
  2. 4 kilometers is 4000 meters.
  3. Half a kilometer is 500 meters.
  4. 4000 − 500 = 3500.
  5. So the answer is 3500.

Words to know

convert
To change from one unit to another.
milliliter
A small unit of liquid. 1,000 make a liter.

Watch out

Try it

  1. On Omar's farm, he pours 4 point 4 liters of juice. Then he pours 6 point 9 liters more. How many liters in all?
  2. On Omar's farm, a tank holds 2 liters of water. He fills 3 cups with 200 milliliters each. How many milliliters are left?
  3. On Omar's farm, he walks a quarter of a kilometer each day. He walks for 2 days. How many meters in all?
Answers: 1. 11.3 · 2. 1400 · 3. 500
For grown-upsRead the amounts on a drink bottle and a bag of flour and change the units.
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