Unit Conversions Practice Test Worksheets
Build confidence with printable metric unit conversion worksheets and focused maths practice tests. Students learn to convert between millimetres, centimetres, metres, kilometres, grams, kilograms, tonnes, millilitres, and litres while improving accuracy with multi-step measurement word problems.
For students who know the metric units, but need practice choosing the right operation inside word problems.
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What Do Unit Conversion Questions Look Like?
Students are given word problems involving metric measurements and must convert between units such as millimetres, centimetres, metres, grams, or litres. Questions often require calculating a total or an equal share before converting to the requested unit. Here is a worked example.
Convert a Total from Millimetres to Centimetres
Question: Suresh collected 4 nails, each measuring 17 mm. How many CENTIMETRES did he collect in total?
Worked Method
Step 1: Find the total length first: 4 × 17 mm = 68 mm.
Step 2: Convert millimetres to centimetres. Since 1 cm = 10 mm, divide by 10.
Step 3: 68 ÷ 10 = 6.8 cm.
Answer: B (6.8 cm)
Tip: You can also convert each nail first: 17 mm = 1.7 cm, then 4 × 1.7 cm = 6.8 cm. Both orders give the same total.
Rules to Help You Solve Unit Conversion Questions
As shown in the example above, keeping track of metric conversion factors and calculating in the right order ensures accurate answers. Use these core rules to choose whether to multiply or divide when changing between units.
Rule 1: Know the conversion scale
Use the metric steps before doing anything with the answer options.
Examples: 1 cm = 10 mm, 1 m = 100 cm, 1 km = 1000 m, 1 l = 1000 ml, 1 g = 1000 mg, 1 kg = 1000 g, and 1 tonne (t) = 1000 kg.
Rule 2: Smaller units make bigger numbers
When converting from a larger unit to a smaller unit, multiply by the conversion factor.
Example: 0.25 × 1000 = 250, so 0.25 kg = 250 g.
Rule 3: Larger units make smaller numbers
When converting from a smaller unit to a larger unit, divide by the conversion factor.
Example: 6000 ÷ 1000 = 6, so 6000 mg = 6 g.
Rule 4: Identify whether you need a total or a share
For identical items, multiply the amount per item by the number of items to find the total. For equal shares, divide the total amount by the number of shares. You can convert before or after this step; choose the order that makes the arithmetic easier and keep track of the units.
Example: 8 l shared equally between 10 containers is 0.8 l = 800 ml each. Alternatively, convert 8 l to 8000 ml first, then divide by 10 to get 800 ml.
Two More Worked Examples
Practise sharing a liquid volume before converting to millilitres, then see how converting first simplifies a decimal mass calculation.
Share Litres, Then Convert to Millilitres
Question: Sunil has 8 l of soup. He pours it equally into 10 mugs. How many MILLILITRES of soup are in each mug?
Worked Method
Step 1: Find each share in litres: 8 ÷ 10 = 0.8 l.
Step 2: Convert litres to millilitres. Since 1 l = 1000 ml, multiply by 1000.
Step 3: 0.8 × 1000 = 800 ml.
Answer: C (800 ml)
Tip: Do not convert the whole 8 l and stop. The question asks for the amount in each mug.
Find a Total Mass from Decimal Measurements
Question: Rafael owns 9 bags of flour. Each one weighs 0.25 kg. How many GRAMS is that altogether?
Worked Method
Step 1: Convert one bag to grams to make the multiplication easier. Since 1 kg = 1000 g, one bag weighs 0.25 × 1000 = 250 g.
Step 2: Find the mass of all nine bags: 9 × 250 g = 2250 g.
Step 3: Check by finding the total in kilograms first: 9 × 0.25 kg = 2.25 kg, which is 2250 g.
Answer: E (2250 g)
Tip: Converting first can turn a decimal calculation into a whole-number calculation. Remember to multiply by the number of bags: 250 g is only one bag.
