Converting between metres and centimetres | Maths | Quizalize & Oak National Academy

Starter quiz

Which unit would you use to measure the length of a whale?
- mm
- cm
- m ✓
- kg
Which unit would you use to measure the length of a book?
- mm
- cm ✓
- m
- kg
What is the length of this toy car?
- '5 cm' ✓
What is the length of this twig?
- 5 cm ✓
- 7 cm
- 12 cm
Starting with the tallest, place these measurements in order of height.
- 1
  
  ⇔
  
  90 cm
- 2
  
  ⇔
  
  80 cm
- 3
  
  ⇔
  
  50 cm
- 4
  
  ⇔
  
  20 cm
- 5
  
  ⇔
  
  10 cm
What is the height of this pebble?
- 2 cm ✓
- 7 cm
- 9 cm

When we change the unit of measurement between metres and centimetres, but the value remains the same, it is known as ______
- equivalent
- converting ✓
If one metre is equal to 100 cm, how many cm are 3 metres equal to?
- '300 cm' ✓
Convert the height of this giraffe from metres to centimetres.
- 5 cm
- 50 cm
- 500 cm ✓
Match the lengths to their equivalent length.
- 2 m
  
  ⇔
  
  200 cm ✓
- 400 cm
  
  ⇔
  
  4 m ✓
- 6 m
  
  ⇔
  
  600 cm ✓
- 1 m 30 cm
  
  ⇔
  
  130 cm ✓
- 250 cm
  
  ⇔
  
  2 m 50 cm ✓
- 1 m 90 cm
  
  ⇔
  
  190 cm ✓
Starting with the shortest, put these measurements in order of length.
- 1
  
  ⇔
  
  1 m 10 cm
- 2
  
  ⇔
  
  2 m 60 cm
- 3
  
  ⇔
  
  430 cm
- 4
  
  ⇔
  
  603 cm
- 5
  
  ⇔
  
  6 m 30 cm
- 6
  
  ⇔
  
  700 cm
A piece of ribbon is 4 m 90 cm long. 300 cm is cut away from the ribbon. What is the length of the ribbon now?
- '1 m 90 cm' ✓

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Using the known fact that 100 cm are equivalent to 1 m can help us convert between cm and m.
Partitioning and using the relationship between 1 m and 100 cm can help us convert between cm, and m and cm.
It is always important to estimate so you know if your answer is near to the real value.

Some children may think that 300 cm is bigger than 3 m because 300 is a bigger number than 3.

1 m is equivalent to 100 cm. So 3 m is equivalent to 300 cm. 3 m and 300 cm are equal in length or height.

Equivalent - When something is equivalent, it is equal in value.
Convert - When we convert, we change the unit of measurement between metres and centimetres, but the value remains the same.