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Worksheet: Estimating Metric Units of Length

In this worksheet, we will practice estimating the length of different real-life objects by choosing the most logical unit of length and value in metric units.

Q1:

Which of the following is the best estimate for the length of a pen?

  • A 12 mm
  • B 12 m
  • C 12 km
  • D 12 cm

Q2:

Engy has 71 dominoes. Each one is 4 centimeters long. If she lines them up end to end as shown, how many meters long is the line of dominoes?

Q3:

Which measurement below is closest to the length of a car?

  • A100m
  • B1m
  • C200m
  • D3m

Q4:

Which of the following is a reasonable length for a tennis racket?

  • A 1 m
  • B 25 cm
  • C 2 m
  • D 60 cm
  • E 4 m

Q5:

How long is the shown object in reality? Choose the answer that gives the best estimation.

  • A 50 cm
  • B 60 cm
  • C 70 cm
  • D 6 cm
  • E 100 cm

Q6:

Estimate, in centimetres, the most likely length of a rubber.

  • A 20 cm
  • B 40 cm
  • C 60 cm
  • D 4 cm
  • E 80 cm

Q7:

Which of the following is a reasonable length for a spoon?

  • A 2 m
  • B 50 cm
  • C 1 m
  • D 10 cm
  • E 3 m

Q8:

Which of the following is a reasonable length for a toothbrush?

  • A 5 dm
  • B 70 cm
  • C 12 mm
  • D 12 cm
  • E 2 m

Q9:

Which of the following is the best approximation for the length of an adult’s leg?

  • A 2 m
  • B 7 mm
  • C 30 dm
  • D 80 cm
  • E 9 cm

Q10:

Which of the following would be the best estimate for the length of an adult’s shoe?

  • A 90 cm
  • B 4 mm
  • C 8 dm
  • D 28 cm
  • E 7 m

Q11:

Estimate the answer in centimetres and complete the following statement: The length of your bed is .

  • A 20 cm
  • B 5 cm
  • C 7 cm
  • D 200 cm
  • E 30 cm

Q12:

Which unit is most suitable for measuring the height of the great pyramid in Egypt?

  • A m
  • B cm

Q13:

Which of these is most likely to be the distance between two cities?

  • A 84 m
  • B 2 0 0 0 cm
  • C 44 km

Q14:

Which of these is most likely to be the length of a car?

  • A 3 cm
  • B 10 m
  • C 10 cm
  • D 3 m

Q15:

Which measurement below is closest to the length of a pencil?

  • A 90 cm
  • B 50 cm
  • C 1 cm
  • D 8 cm

Q16:

Which of the following would be the best estimate for the length of an adult's little finger?

  • A 34 cm
  • B 1 cm
  • C 2 cm
  • D 6 cm
  • E 90 cm

Q17:

Choose the best unit to measure the height of a building.

  • A m
  • B cm

Q18:

Which unit is most suitable for measuring the length of a pen?

  • A cm
  • B m

Q19:

Which of the following would be the best approximation for the length of the longest side of a maths book?

  • A 70 cm
  • B 2 cm
  • C 5 cm
  • D 25 cm
  • E 60 cm

Q20:

What is the approximate height of the Cairo Tower?

  • A 200 cm
  • B 2 m
  • C 2 cm
  • D 200 m

Q21:

Sally wants to measure the length of a plant cell. She has a microscope and a stage micrometer. Would she be more accurate measuring the length to the nearest millimeter or micrometer?

  • A to the nearest micrometer
  • B to the nearest millimeter

Q22:

Nabil estimates the height of a mountain to be cm. Is this realistic?

  • ANo
  • BYes

Q23:

Which of the following is a reasonable length for a door key?

  • A 1 m
  • B 50 cm
  • C 2 m
  • D 6 cm
  • E 5 m

Q24:

Which of these is most likely to be the height of a classroom?

  • A 300 m
  • B 10 cm
  • C 10 m
  • D 300 cm

Q25:

Which of these is most likely to be the height of a teacher?

  • A 160 m
  • B 40 cm
  • C 10 m
  • D 160 cm

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