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      Use known facts to carry out conversions that correspond to 10 and 100 parts

      Lesson details

      Learning outcome

      I can use known facts to carry out conversions that correspond to 100 parts.

      Key learning points

      1. If 1 cm = 10 mm, then 3 cm = 3 x 10 mm = 30 mm
      2. If 1 m = 100 cm, then 3 m = 3 x 100 cm = 300 cm
      3. If £1.00 = 100 p, then £3.00 = 3 x 100 p = 300 p

      Keywords

      • Equivalent - If two or more things have the same value, they are equivalent.

      • Convert - Change a value or expression from one form to another.

      Common misconception

      Pupils might see a number like 9.2 m and incorrectly partition it into 9 m and 2 cm.

      It is essential that pupils are exposed to lots of examples of visual models, such as parts of circles and number lines, so that they have a secure understanding of why, in this case, the 0.2 m is equal to 20 cm.

      Teacher tip

      Pupils may have had experience of multiplying the number of centimetres by 10 to get the number of millimetres. This lesson encourages children to use their knowledge of what larger units are composed of, leading them to say, 'If I know..., then I know...', as this leaves less room for error.

      Licence

      This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      Match the unit of measure to the correct abbreviation.

      Correct Answer:centimetre ,cm

      cm

      Correct Answer:metre ,m

      m

      Correct Answer:pence,p

      p

      Correct Answer:millimetre,mm

      mm

      Q2.
      Which of these numbers are multiples of 10?

      10.5
      Correct answer: 60
      59
      Correct answer: 50
      25

      Q3.
      Which of these numbers are multiples of 100?

      Correct answer: 100
      105
      250
      Correct answer: 500
      590

      Q4.
      How many millimetres are there in a centimetre?

      Correct Answer: 10, ten, 10 mm

      Q5.
      How many pennies are there in £1.00?

      Correct Answer: 100, one hundred

      Q6.
      How many centimetres are there in one metre?

      Correct Answer: 100, one hundred

      6 Questions

      Q1.
      Look at the image. What is this length written as a decimal?

      An image in a quiz
      0.6 cm
      1.0 cm
      Correct answer: 1.6 cm
      0.16 cm

      Q2.
      Convert 1.6 cm into mm. mm

      An image in a quiz
      Correct Answer: 16, 16mm

      Q3.
      Convert £5.60 into pence. p

      Correct Answer: 560, 560p

      Q4.
      Convert 7.25 m into cm. cm

      Correct Answer: 725, 725cm, 725 cm

      Q5.
      Convert 8.75 m into cm. cm

      Correct Answer: 875, 875 cm, 875cm

      Q6.
      Order these distances from shortest to longest:

      1 - 2 $$ \frac{1}{4} $$ m
      2 - 2.4 m
      3 - 250 cm

      To help you plan your 5 maths lesson on: Use known facts to carry out conversions that correspond to 10 and 100 parts, download all teaching resources for free and adapt to suit your pupils' needs...