A Maths Dictionary for Kids

A Maths Dictionary for Kids is an online math dictionary for students which explains over 955 common mathematical terms and math words in simple language with definitions, detailed visual examples, and online practice links for some entries. 

http://www.amathsdictionaryforkids.com/ 

It includes 270 free worksheets arranged according to topic (numbers, operations, fractions, decimals, percentages, ratios, algebra, statistics, probability, geometry, measurement, time, money, symbols…)

http://www.amathsdictionaryforkids.com/MathsChartsPDFs/mathschartsPDFs.html