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Same & Different: Hundreds Charts

Look at the two pictures. What do you notice?

A: On a hundreds chart, numbers 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, and 99 are shaded purple. B: On a hundreds chart, numbers 11, 22, 33, 44, 55, 66, 77, 88, and 99 are shaded purple.
  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. Draw or describe a third pattern on a hundreds chart. Explain how your picture is the same as pictures A and B, and how it is different.
This hundreds chart has 10 rows of 10 squares. The squares count from 1 to 100, in order from left to right across the rows.
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