Grade 2/Length & Height
Using a benchmark to estimate lengths (metric) (82)
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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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
Prerequisites
- Counting to 20