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Grade 6 · Maths · Lessons
Changing the unit
📏km and m🦶ft and in✖️multiply➗divide
Changing the unit.
The big ideaThe fact is a column. Do the same to both rows, and let the units cancel.

How it works

A unit fact is a column: 1 km = 1000 m. Do the same to both rows, and let the units cancel.

7 km is 7 × 1000 = 7000 m.

5 ft is 5 × 12 = 60 in.

km• 1• 7m• 1000• 7000
A fact as a table.

Example 1: Kilometers to meters

  1. 7 km is how many meters?
  2. 1 km = 1000 m, so multiply by 1000: 7 × 1000 = 7000.
  3. 7 km is 7000 m.

Example 2: Feet to inches

  1. 5 ft is how many inches?
  2. 1 ft = 12 in, so 5 × 12 = 60.
  3. 5 ft is 60 in.

Example 3: Another

  1. 3 ft is how many inches?
  2. 3 × 12 = 36.
  3. 3 ft is 36 in.

Words to know

unit fact
A fact like 1 km = 1000 m.
cancel
To remove a unit that appears on top and bottom.

Watch out

Try it

  1. How many meters in 4 km?
  2. How many inches in 2 ft?
  3. How many feet in 36 in?
  4. How many centimeters in 5 meters?
Answers: 1. 4000 · 2. 24 · 3. 3 · 4. 500
For grown-upsMeasure a room in feet and change it to inches.
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