Mystery color by number

Mystery color by number pictures: every shape is a triangle, so the outlines give nothing away. Color by the numbers and the hidden picture slowly appears. Each one comes with a small hint, if you want it. The smaller grids suit kids; the larger ones are for adults.

Color them online for free with nothing to install, or print a mystery color by number worksheet with a color key. In class, the easy ones also work as mystery math worksheets: solve each sum to reveal the picture.