Estimating lengths · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
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Guessing length before you measure

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

  1. A reference strip is 2 feet long. A shelf looks about as long as three of these strips end to end. Estimate the shelf's length in feet.

    Answer: ______________

  2. A book is wider than a 12 cm strip but narrower than an 18 cm strip. Where should an estimate of its width fall?

    • Between 12 cm and 18 cm
    • Between 1 cm and 6 cm
    • Between 20 cm and 26 cm
    • Between 30 cm and 36 cm

  3. What do we call a smart guess about how long something is, made before you measure it?

    • A measurement
    • An estimate
    • A measuring tool

  4. After you estimate a length, you should measure it to see how close your guess was.

    Circle one:   True   False

  5. Kai estimates a ribbon is 10 inches long. His reference strip is 2 inches long. How many strips end to end would match his estimate?

    Answer: ______________

  6. A pencil looks about as long as six one-inch strips placed end to end. What is your estimate?

    • About 6 inches
    • About 6 metres
    • About 6 feet

  7. A classroom rug looks about as long as four metre sticks placed end to end. Which estimate uses that reference correctly?

    • About 4 centimetres
    • About 40 metres
    • About 40 centimetres
    • About 4 metres

  8. One estimate is 2 inches from the measurement. Another is 3 cm from it. Max says the first is closer because 2 is smaller than 3. Is that comparison valid?

    Circle one:   True   False

  9. A whiteboard is narrower than a wall measured as 6 m wide. Leo estimates the board's width is 500 m. Which check shows a problem with his estimate?

    • 500 m fits within the wall's measured width
    • 500 m exceeds the wall's 6 m width
    • 500 m and 6 m are two names for the same width

  10. Lena estimates a board is 20 cm wide. Measuring shows it is 3 cm wider than her estimate. What is its measured width in centimetres?

    Answer: ______________

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Answer key

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

Guessing length before you measure W1-mt_OzRZ89GrQW-s1

  1. 6 · 2 + 2 + 2 = 6. The shelf is about 6 feet long.
  2. Between 12 cm and 18 cm · The measured strips set limits. The book's estimated width should be between 12 cm and 18 cm.
  3. An estimate · An estimate is your best guess about length before you check with a ruler or tape.
  4. True · Checking your estimate against the real measurement tells you how good your guess was.
  5. 5 · 2 + 2 + 2 + 2 + 2 = 10 inches. Five reference strips match the estimate.
  6. About 6 inches · Each reference strip is one inch long. Six of them give an estimate of about 6 inches.
  7. About 4 metres · Each metre stick is 1 metre long. Four end to end give an estimate of about 4 metres.
  8. False · The gaps use different units. Max cannot compare just the numbers; he needs both gaps in the same unit.
  9. 500 m exceeds the wall's 6 m width · The board is narrower than the 6 m wall. Since 500 m is greater than 6 m, the estimate cannot fit the given comparison.
  10. 23 · The measurement is 3 cm greater than 20 cm. 20 + 3 = 23 cm.
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