Grade
3

Same & Different: Weighty Numbers

Look at the two pictures. What do you notice?

A. shows a bag with colored square tiles inside and 3 tiles outside of the bag. The collection weighs 30 grams. B. shows an empty bag with 10 tiles outside of the bag. The collection weighs 30 grams.
  1. How are pictures A and B mathematically the same, and how are they different?
    • A and B are the same because …
    • A and B are different because …
  2. Use numbers or an equation to show what is happening in the pictures.
  3. Make a third picture that shows a scale with some tiles on it. Explain how your picture is the same as pictures A and B, and how it is different.
Printable Version

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Reference for Educators

Sample problems and solutions