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Measuring Length with Decimals

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Measuring Length with Decimals

Use 10 mm = 1 cm. Write decimal measurements in centimetres where asked. Show your thinking for the problem-solving questions.

A. Read and convert measurements

1.A strip of blue tape is 16 cm and 4 mm long. Write its length as a decimal number of centimetres.
2.A craft club cuts three lengths of string. Convert each measurement to centimetres: (a) 7 cm 2 mm (b) 13 cm 6 mm (c) 20 cm 9 mm.
3.A paper plane has a wingspan of 12.8 cm. How many millimetres is that?
4.Which piece of cord is longer: 15.3 cm or 15.7 cm? Choose one and explain how the tenths help you decide.

B. Place, compare and round

5.The number line shows a measurement between 8 cm and 9 cm. Mark 8.6 cm on the line. Is it closer to 8 cm or 9 cm?
88.18.28.38.48.58.68.78.88.99
6.Round 14.3 cm to the nearest centimetre. Use the tenths digit to explain your answer.
7.Round 9.5 cm to the nearest centimetre. What happens when the tenths digit is 5?

C. Measurement challenge

8.Mei measures three shells: Shell A is 6.8 cm, Shell B is 7.1 cm, and Shell C is 6.5 cm. Put the shells in order from shortest to longest.
9.A piece of ribbon is 24.6 cm long. Arlo says it is 246 mm long. Is Arlo correct? Show how you know.
10.A cardboard rocket is 18 cm 7 mm long. Write its length as a decimal in centimetres, then round it to the nearest centimetre.

2 printable pages

  • Measuring Length with Decimals, page 1 of 2: A. Read and convert measurements

    Page 1

  • Measuring Length with Decimals, page 2 of 2: B. Place, compare and round, C. Measurement challenge

    Page 2

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