Converting metric units on a double number line

The Maths Habit

Mo and Ana measure the same stick. Who is right?

0100Mo: it is 1 long. Ana: it is 100 long.

Both. It is 1 metre and it is 100 centimetres: the same length in two units.

Unit
The amount we count in when we measure.
Convert
Write the same amount in a different unit.
Double number line
Two lines with their marks lined up, one line for each unit.

mcm00110022003300
  1. Fill in the small units.1 m is 100 cm, so the marks go 0, 100, 200, 300.
  2. Find the number on one line.2 on the m line.
  3. Read straight across.2 m = 200 cm

How many centimetres make 1 metre?

1 m = ? cm 100 cm

How many grams make 1 kilogram?

1 kg = ? g 1000 g

Write 2 m in cm. Fill in the small units. Find the number on one line. Read straight across. 200 cm

mcm001234100200300400

Write 2 l in ml. Fill in the small units. Find the number on one line. Read straight across. 2000 ml

lml0011000234200030004000

Write 2 m in cm. Fill in the small units. Find the number on one line. Read straight across. 200 cm

mcm001234100200300400

Write 3 cm in mm. Fill in the small units. Find the number on one line. Read straight across. 30 mm

cmmm00123410203040

Write 2 m in cm. Fill in the small units. Find the number on one line. Read straight across. 200 cm

mcm001234100200300400

Write 3 kg in g. Fill in the small units. Find the number on one line. Read straight across. 3000 g

kgg0011000234200030004000

Write 2 m in cm. Fill in the small units. Find the number on one line. Read straight across. 200 cm

mcm001234100200300400

Write 300 cm in m. Find 300 on the cm line. Read straight up. 3 m

mcm0011002003004003

Write 2 m in cm. Fill in the small units. Find the number on one line. Read straight across. 200 cm

mcm001234100200300400

Write 2.5 l in ml. Fill in the small units. Find the number on one line. Read straight across. 2500 ml

lml0012310002500

Converting metric units on a double number line worksheet, page 1

1 m = 100 cm
5 m × 100 = 500 cm
  1. How many small units make 1 big unit?1 m = 100 cm, 1 cm = 10 mm, 1 kg = 1000 g, 1 l = 1000 ml
  2. Big to small: multiply by it.There are more of the small units.
  3. Small to big: divide by it.There are fewer of the big units.

Big to small or small to big? Multiply or divide?

5 m → cm Big to small: × 100

Big to small or small to big? Multiply or divide?

2000 g → kg Small to big: ÷ 1000

Write 8 m in cm. How many small units make 1 big unit? Big to small: multiply by it. Small to big: divide by it. 800 cm

mcm011002345678800
1 m = 100 cm
8 m × 100 = 800 cm

Write 6 l in ml. How many small units make 1 big unit? Big to small: multiply by it. Small to big: divide by it. 6000 ml

lml011000234566000
1 l = 1000 ml
6 l × 1000 = 6000 ml

Write 8 m in cm. How many small units make 1 big unit? Big to small: multiply by it. Small to big: divide by it. 800 cm

mcm011002345678800
1 m = 100 cm
8 m × 100 = 800 cm

Write 7000 g in kg. How many small units make 1 big unit? Big to small: multiply by it. Small to big: divide by it. 7 kg

kgg001100070007
1 kg = 1000 g
7000 g ÷ 1000 = 7 kg

Converting metric units on a double number line worksheet, page 2

Answer sheet

Thumbs up: right. Thumbs down: wrong.

  1. 4 m = 400 cm

    Right

  2. 5 kg = 500 g

    Wrong: 5000 g

  3. 3000 ml = 3 l

    Right

  4. 60 mm = 600 cm

    Wrong: 6 cm

  1. How many 250 ml glasses can you fill from 1 litre of juice?

    4

  2. Put in order, lightest first: 1.5 kg, 1200 g, 2 kg

    1200 g, 1.5 kg, 2 kg

  3. A 3 m rope is cut into pieces 50 cm long. How many pieces?

    6

  1. Write 4 m in centimetres.

    400 cm

  2. Write 3000 g in kilograms.

    3 kg

  3. Write 2.5 litres in millilitres.

    2500 ml
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