Grade 4 Length Units Worksheets
Change a length between millimeters, centimeters, meters and kilometers.
Every sheet below is generated fresh with a matching answer key. Pick one of the three levels, preview it, and print or download the PDF — no account, no watermark. For the other grade 4 measurement skills, see all measurement worksheets.
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Measurement · Grade 4
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Grade 4 · 2 pages · A4What each level generates
Grade 4 length units — the exact skill behind each difficulty setting, straight from the generator.
- Level 1Convert to a smaller unit
- Level 2Convert to a larger unit
- Level 3Both directions
Grade levels follow the progression common to most English-language curricula — not one specific national curriculum. Every level shows exactly what it generates, so you can check the fit with your own program. See the full scope & sequence →
More Grade 4 measurement skills
Each one generates a different kind of question, with its own three levels and answer key.
- Mass: Grams and KilogramsChange a weight between milligrams, grams and kilograms.
- Units of TimeChange between seconds, minutes, hours, days and weeks.
- Compound MeasurementsRewrite measurements like 3 m 40 cm using one unit, and back again.
- Adding and Subtracting MeasurementsAdd and subtract measurements written in two units.
- Ordering MeasurementsPut three or four measurements in order when the units are mixed.
- Reading Scales and RulersWork out what a ruler, kitchen scale or measuring jug is showing.
- Perimeter in Mixed UnitsFind a perimeter when the sides are given in different units.
Frequently asked questions
▸What measurement skills are expected in Grade 4?
Converting between mixed units and a single unit in both directions, and adding or subtracting measurements written in mixed units with regrouping. Compound Measurements covers the conversions and Adding and Subtracting Measurements covers the arithmetic.
▸How do you write 3 m 40 cm in centimeters?
Convert the whole meters first — 3 m is 300 cm — then add the leftover 40 cm, giving 340 cm. That is the Two units into one level of Compound Measurements, using length, mass and capacity in turn.
▸How do you subtract measurements like 6 kg 50 g − 4 kg 650 g?
Break one whole kilogram into 1000 g so the grams can be taken away: 6 kg 50 g becomes 5 kg 1050 g, then 1050 − 650 = 400 g and 5 − 4 = 1 kg, so the answer is 1 kg 400 g. Converting both amounts to grams first works just as well.
▸Do the answers always come out as whole numbers?
Yes. Every quantity is built from whole units and clean remainders, so answers are exact whole numbers or a tidy mixed pair like 5 m 65 cm — no decimals and no rounding at this grade.