Videos Test Yourself Books MathFacts Math Diagnostics Math Tricks Daily PhysEd
Class Photos Worksheets Teen math Musiclopedia Techlopedia Teacher Timesavers Study Guides


A tree doubles in length each year before attaining its maximun height at the end of ten years.  

Question: How many years will it take before the tree attains half of its maximal height?

Your answer, please

free IQ Test

Brain Teaser Of The Week