Grade
3

Mobile Math: Number Chimes

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

Find the missing values so that each string in the mobile has the same value.

A balanced mobile has three strings and a total value of 60. The left string has 5 purple circles. The middle string has 4 orange squares. The right string has 10 blue triangles. The values of the shapes are unknown.

What is the value of each string? Remember, each string has the same value when the mobile is balanced.

___ + ___ + ___ = 60

How many triangles are equal to 1 circle? How do you know?

If the total value of the mobile is changed to 120, how can you change the values of the shapes so that the mobile remains balanced?

A balanced mobile has three strings and a total value of 120. The left string has 5 purple circles. The middle string has 4 orange squares. The right string has 10 blue triangles. The values of the shapes are unknown.
Printable Version

Google doc for printing and copying

Reference for Educators

Sample problems and solutions