Converting units of length | Maths | Quizalize & Oak National Academy

Starter quiz

Match the expression to their product.
- 4 × 100 =
  
  ⇔
  
  400 ✓
- 4 × 10 =
  
  ⇔
  
  40 ✓
- 4 × 1 =
  
  ⇔
  
  4 ✓
- 6 × 10 =
  
  ⇔
  
  60 ✓
- 6 × 100 =
  
  ⇔
  
  600 ✓
- 6 × 0 =
  
  ⇔
  
  0 ✓
13.09 x 10 = ?
- 13.090
- 13.9
- 139
- 130.9 ✓
- 1309
When we multiply 0.72 by 100, what is the new value of the digit 7?
- seven hundredths
- seven tenths
- seven ones
- seven tens ✓
- seven hundreds
Match the expression to the correct product.
- 0.31 × 10
  
  ⇔
  
  3.1 ✓
- 0.31 × 1,000
  
  ⇔
  
  310 ✓
- 5.76 × 10
  
  ⇔
  
  57.6 ✓
- 5.76 × 100
  
  ⇔
  
  576 ✓
- 0.23 × 10
  
  ⇔
  
  2.3 ✓
- 0.23 × 100
  
  ⇔
  
  23 ✓
Lucas is thinking of a number. His number is one hundredth times the size of 4 What is his number?
- 0.004
- 0.04 ✓
- 0.4
- 40
- 40
What is the perimeter of a rectangular field of length 350 m and width 250 m? ______ m.
- '1,200' ✓

Exit quiz

Match the equivalent lengths
- 10.3 cm `
  
  ⇔
  
  103 mm ✓
- 13 cm
  
  ⇔
  
  130 mm ✓
- 130 cm
  
  ⇔
  
  1,300 mm ✓
- 130 cm
  
  ⇔
  
  1.3 m ✓
- 1030 cm
  
  ⇔
  
  10.3 m ✓
Match the equivalent lengths.
- 250 cm
  
  ⇔
  
  25 dm ✓
- 250 cm
  
  ⇔
  
  2.5 m ✓
- 25 m
  
  ⇔
  
  250 dm ✓
- 25 m
  
  ⇔
  
  2,500 cm ✓
- 25 dm
  
  ⇔
  
  2,500 mm ✓
Which of these is the correct conversion of 9,035 m into km?
- 9,035 m × 1,000 = 9,035,000 km
- 9,035 m ÷ 1,000 = 0.935 km
- 9,035 m ÷ 1,000 = 0.9035 km
- 9,035 m ÷ 100 = 90.35 km
- 9,035 m ÷ 1,000 = 9.035 km ✓
True or false? A line measuring 104 mm is longer than a line measuring 11 cm.
- True
- False ✓
Starting with the smallest, put these measurements in order.
- 1
  
  ⇔
  
  603 cm
- 2
  
  ⇔
  
  6.1 m
- 3
  
  ⇔
  
  613 cm
- 4
  
  ⇔
  
  6.3 m
- 5
  
  ⇔
  
  631 cm
The width of a rectangular lake is 700 m and the length is 0.91 km. What is the perimeter of the lake? Give your answer in kilometres. ______ km
- '3.22' ✓

Worksheet

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Lesson Details

Key learning points

There are 10 mm in 1 cm.
There are 100 cm in 1 m.
There are 1,000 m in 1 km.
There are 1,000 mm in 1 m.
There are 10 dm in 1 m.

Common misconception

Children may confuse when to multiply or when to divide.

Encourage children to think about which unit of measure is larger e.g. km are larger than m. In a given amount, there will be fewer of the larger unit so we need to divide.

Keywords

Convert - To convert means to change a value or expression from one form to another. In this context it means to change from one unit of measurement to another such as from cm to mm.
Decimetre - A decimetre is a metric unit of length, equal to one-tenth of a metre. Decimetre can be abbreviated to dm.