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First/Length Height

Using a benchmark to estimate lengths (metric)

Practice measuring objects using pictures and logic. Read the problem to find the length in units like inches, centimeters, or blocks.
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Practice Questions

  1. The cube 🧊 is 1 cm wide. The eraser 🧼 is about 5 cubes long. How long is the eraser? ? cm
    Show answer

    5 cm

  2. The bug 🐛 is 2 cubes 🧊 long. How long is the bug? ? cm
    Show answer

    2 cm

  3. The crayon 🖍️ is 8 cubes 🧊 long. How long is the crayon? ? cm
    Show answer

    8 cm

  4. The sharpener ✏️ is 3 cubes 🧊 wide. How wide is the sharpener? ? cm
    Show answer

    3 cm

Teacher Resources
Teaching Notes

Focus on the concept of a 'unit' of measure.

Vocabulary
Benchmark: An object used for comparison to estimate length.
Estimate: To find an approximate value or size.
Centimeter (cm): A metric unit used to measure length.
Common Mistakes
  • Confusing cm with inches if not clearly labeled.
Extension Activities
  • Estimate the length of a book cover using a centimeter cube as a benchmark.
  • Compare the metric lengths of two different objects by estimating first.
Parent Tip

Use everyday objects (like a pencil or a finger) as benchmarks to estimate the metric length of other items. Then, use a ruler to check.

Learning Path
Skill Level

beginner

Skills Practiced
Metric estimation