This topic is in the 'Decimals' section. Decimals are pretty cool, because they help fill in the spaces between the whole numbers that you're more familiar with. What's amazing is that the same rules you learned for adding, subtracting, dividing, and multplying whole numbers apply to decimals. So the good news is that even though decimals look a bit different from whole numbers, the tools you've learned to apply to whole numbers apply to decimals just as well!