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Home > MC1 > Chapter 2 > Lesson 2.3.1 > Problem 2-105


Emily and Shilpa were looking at some groups of pennies. Emily sees pennies. Emily thinks there are pennies, but Shilpa thinks there are pennies.

  1. Who is correct? Why?

    Think about what the expression represents. Try finding the answer on your own before looking at the solution.

    Shilpa is correct. Three groups of pennies plus more pennies is equal to pennies.

  2. Draw a diagram to show the possible arrangement of the pennies. (For help, see Lesson 1.2.1.)

    Remember to clearly show the groups and the remaining pennies in your diagram.

  3. Describe what a penny diagram might look like for the incorrect answer given by one of the girls above.

    Since Emily thinks there are pennies, draw a diagram which has groups of .