Long and Short
NCERT Math-Magic for Class 3, Chapter 4 compares long and short to introduce length measurement. Children measure pencils, ribbons and corridors with handspans and fingers, then see why the metre and centimetre give fair results for everyone. They use rulers and tapes, estimate before measuring, and order objects from shortest to longest. Stories about tailors, carpenters and running races keep it lively. It teaches standard units, careful alignment from zero, and judging distances that map and craft work need.
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