Shark Learning
Grade 2/Length & Height

Using a benchmark to estimate lengths (inches)

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 paperclip 📎 is 1 inch long. The pencil ✏️ is about 4 paperclips long. How long is the pencil? ? inches
    Show answer

    4 inches

  2. The measurement unit is a paperclip 📎. The eraser is about 1 paperclip long. How long is the eraser? ? inch
    Show answer

    1 inch

  3. The marker 🖊️ is about 5 paperclips 📎 long. How long is the marker? ? inches
    Show answer

    5 inches

  4. The key 🗝️ is about 2 paperclips 📎 long. How long is the key? ? inches
    Show answer

    2 inches

Teacher Resources
Teaching Notes

Explain that 'benchmark' means using a known length to guess an unknown length.

Vocabulary
Benchmark: An object used for comparison to estimate length.
Estimate: To find an approximate value or size.
Common Mistakes
  • Students may try to measure with a real ruler instead of using the benchmark visual.
Extension Activities
  • Estimate the length of a room using your own feet as a benchmark.
  • Compare the lengths of two objects by estimating which is longer before measuring.
Parent Tip

Have your child estimate the length of common household items using a familiar object (like a dollar bill or a credit card) as a benchmark, then measure to check.

Learning Path
Skill Level

beginner

Skills Practiced
Estimating length