Grade
3

Mobile Math: Heavy Weights?

Look at the mobile below. What do you notice? What do you wonder?

Find the missing values so that the mobile is balanced.

This mobile is balanced. The left side has 1 string with 6 triangles. The right side is balanced between 2 strings. The left string has 3 squares. The right string has 6 circles. The value of each triangle is 6. The values of other shapes are unknown.

If the value of the triangle is now 4, how can you change the values of the other shapes so that the mobile remains balanced?

This mobile is balanced. The left side has 1 string with 6 triangles. The right side is balanced between 2 strings. The left string has 3 squares. The right string has 6 circles. The value of each triangle is 4. The values of other shapes are unknown.

How many circles are equal to a triangle? How do you know?

Printable Version

Google doc for printing and copying

Seesaw Version

Activity for the Seesaw platform

Reference for Educators

Sample problems and solutions