Free Online Math Dictionary for Kids. " A free online math dictionary for kids, with pictures helping kids understand the meaning of the math concepts. A great learning tool for school age kids." " When kids start learning math beyond counting, they start to encounter math concepts that they need understand precisely the meaning, or they may have trouble. For example, they need know the meaning of “Angle”, and the differences between “Acute Angle”, “Obtuse Angle”, “Right Angle” and “Straight