Grade
4

Mobile Math: Missing Values

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

Find the missing values so that the mobile is balanced.

A mobile with two balanced strings has a value of 600. The left string has 3 triangles. The right string has 1 hexagon and 2 squares. Each square has a value of 81. What values do the hexagon and triangles have?
A mobile with two balanced strings has an unknown value. The left string has 3 triangles. The right string has 1 hexagon and 2 squares. Each square has a value of 81. What values could the hexagon and triangles have?

The total value of the mobile is now up to you. What values could each of the pieces have that would allow the mobile to be balanced?

A mobile with two balanced strings has an unknown value. The left string has 3 triangles. The right string has 1 hexagon and 2 squares. Each triangle has a value of 1-half. What values could the hexagon and squares have?

If the value of the orange triangle is now ½, what values could each of the pieces have that would make the mobile be balanced?

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Reference for Educators

Sample problems and solutions