Measuring with different units · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Measuring with different units

Mathematics · Measurement · ages 7-8
Name ______________________   Date ____________

  1. Four equal tiles each cover 2 cm. They lie end to end without gaps or overlaps. How many centimetres do they cover?

    Answer: ______________

  2. A desk reads 30 on a cm scale and about 12 on an inch scale, rounded to whole inches. Which record keeps both units with their readings?

    • 30 inches; about 12 cm
    • 30 cm; about 12 cm
    • 30 cm; about 12 inches
    • 30 inches; about 12 inches

  3. A table is 80 centimetres long. Will its measurement in inches be a bigger or smaller number than 80?

    • A bigger number
    • A smaller number
    • The same number

  4. Which unit is shorter: a centimetre or an inch?

    • A centimetre
    • An inch
    • They are equal

  5. One strip is 18 cm long and another is 12 cm long. How many centimetres longer is the first strip?

    Answer: ______________

  6. One strip is 5 centimetres long. Another is 5 inches long. Which strip is longer?

    • They are equally long
    • The 5-centimetre strip
    • The 5-inch strip

  7. Ava wants to test how unit size changes a measurement count. Which plan changes only the unit size?

    • Keep the strip; use shorter units
    • Cut the strip; keep the same units
    • Stretch the strip; use longer units
    • Swap the strip; keep the same units

  8. A long rope needs 20 large units. A different, short string needs 10 small units. Sam says these counts are impossible because smaller units must always give the larger count. Is his claim correct?

    Circle one:   True   False

  9. Ravi says his 6-metre rope is also 6 centimetres long. What should its centimetre number be?

    • Exactly 6, because the rope keeps its original length
    • Greater than 6, because centimetres are shorter units
    • Less than 6, because centimetres are shorter units

  10. Three equal units cover a 12 cm ribbon exactly, end to end without gaps or overlaps. How many centimetres long is each unit?

    Answer: ______________

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Answer key

For grown-ups. Fold this page away before handing over the rest.

Measuring with different units W1-mt_jHv4BgRK8B-s1

  1. 8 · Add four lengths of 2 cm: 2 + 2 + 2 + 2 = 8 cm.
  2. 30 cm; about 12 inches · Keep 30 with cm and about 12 with inches.
  3. A smaller number · Inches are longer units than centimetres. Fewer inches cover the same table, so the inch number is smaller.
  4. A centimetre · An inch is longer than a centimetre. A centimetre is the shorter unit.
  5. 6 · Both lengths use centimetres. Their difference is 18 - 12 = 6 cm.
  6. The 5-inch strip · Both counts are 5, but inches are longer units. The 5-inch strip is longer.
  7. Keep the strip; use shorter units · Keep the strip's length unchanged and change only the measuring unit.
  8. False · The rule compares the same length. These objects have different lengths, so their counts could both be correct.
  9. Greater than 6, because centimetres are shorter units · Centimetres are shorter than metres. More than six centimetres are needed to cover the same rope.
  10. 4 · Three equal 4 cm lengths make 12 cm: 4 + 4 + 4 = 12.
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