Grade
1

Same & Different: Up & Down the Number Line

Look at the two pictures. What do you notice?

A. shows a number line from 0 to 100. An arrow points from 90 to 20. Red 90 minus blue 70 = purple question mark. B. shows a number line from 0 to 100. An arrow points from 70 to 90. Blue 70 + purple question mark = red 90.
  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. Make a third picture that represents a problem with a missing number.
    Explain how your picture is the same as pictures A and B, and how it is different.
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Reference for Educators

Sample problems and solutions