Math in Our World: Character Cards

Ricor collects character cards. He has collected a total of 250 cards over the past 10 months. He has run out of space in his old binder for them, and he plans to collect more.

His old binder holds 9 cards per page and has 20 pages.

His new binder holds 8 cards per page, but it has 46 pages.

  1. What do you notice? What do you wonder?
  2. Use pictures, models, or numbers to show what is happening.
  3. What mathematical questions can you ask about this situation? Answer all the questions you can!
  • How many cards are in the old binder?
  • How many cards can fit in the new binder? Consider using an open array or ratio table to find the answer.
  • How many more cards might Ricor collect?

Show your work to someone else, and explain your thinking. Did they understand?
Ask whether they have any other questions you can answer!

I like to collect things when I go on walks. Sometimes I collect pebbles. Sometimes I collect leaves. Ask a trusted adult to go on a walk with you and see what you can collect. How could you group your collection?