Directions: Using the counting numbers 1 to 6, each only once, fill in the graph and blanks to make the statements true.

- There are twice as many dogs as cats.
- There are twice as many cats as birds.

There are ___ dogs, ___ cats and ___ birds in class.

### Hint

What relationships do you need to know?

What elements do you need to have in your graph?

What elements do you need to have in your graph?

Source: Bryan Anderson

Love this task. I could see the discussion going many different directions from patterns to doubling numbers (how much do kids love that!?) to even/odd to working backwards to solve a problem.

This can also be easily adapted to other grades by changing the numbers or even changing the subject and allowing for fractions. Maybe this is appropriate for grades 3-5 is you use cookies instead of people and open it up to any number 0-6.

The directions would need to be modified a little to include numbers 1-8 for the second solution to work.

Thanks for pointing that out, I reworked the problem from an upper grade and forgot to omit that answer