PPT Slide
Ethan hammered a nail into the trunk of a young tree. Explain why the nail was still the same height from the ground twenty years later even though the tree had grown to a height of 22 meters.
Source: TIMSS-R 1999 Benchmarking Study
Top 10%TIMSS International Benchmark
An Item That Students Reaching the Top 10% International Benchmark Are Likely to Answer Correctly*