Oh I love Freerice, it's amazing. It even has an app, and there are so many different subjects to choose from! Honestly, for each question you get right, 10 grains of rice are donated, it isnt much, but it quickly adds up. From various languages, English vocab, Maths, Elements, Geography, Art, it has everything. For a bit of fun, and learning give it a go!
God I remember this! Our French teacher used to let us play it in class - french vocab of course - and one girl got up to like 10000 or something! It's so fun!