Grade
1

Same & Different: Missing Number

Look at the two pictures. What do you notice?

A. shows a number line from 0 to 10. Arrows show 3 jumps back from 5 to 4 to 3 to 2. The equation is red 5 minus blue 3 = purple question mark. B. shows a number line from 0 to 10. Arrows show 2 jumps forward from 3 to 4 to 5. The equation is blue 3 + purple question mark = red 5.
  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.
Printable Version

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Reference for Educators

Sample problems and solutions