You completed "The Lost Talisman" and found the "0"! Thanks to you, we have recovered the integrity of our numerical system with all its digits. The mathematical experience can go on! This single element is essential to complete our decimal number system. Now we can add, subtract, multiply or divide using a coherent numerical system; we can even use scientific notation that uses the power of ten. We can do all this because we have a numerical system with ten digits.

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Achievement badges reward students for achieving small goals as they work towards their ultimate goal of mastering all mathematical concepts at their specified grade level.