Grade
2

Math in Our World: Our Dog, Sister

This is our dog, Sister. She is a yellow Lab. Last year, Sister weighed 60 pounds. This year, Sister weighs 70 pounds.

This is Jimmy. Last year, Jimmy weighed 22 pounds. This year, Jimmy weighs 35 pounds less than Sister.

Sister lays on the floor. Toddler Jimmy crouches beside Sister and rests his head on her side.
  1. Use pictures, models, or numbers to show what is happening.
  2. What do you notice? What do you wonder?
  3. What math questions can you ask about this situation? Answer all the questions you can!
  • Sketch one or more number lines and label the information you know.
  • How much more did Sister weigh than Jimmy last year? How much more does she weigh than Jimmy this year? How could you figure this out?
  • How much did Jimmy and Sister weigh together last year? How much do they weigh together this year?
  • Show your work to someone else, and explain your thinking. Did they understand?
  • Ask whether they have any other questions you can answer!

Do you have a pet? If you do, can you weigh them? Does your pet weigh more or less than you? How much more? How much less? If you don’t have a pet, what is an object that weighs more than you? How much more? What is an object that weighs less than you? How much less?

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Reference for Educators

Sample problems and solutions