Well, decimals can be used for voting.
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money uses decimals
You would use it when adding fractions.
Well there is always money. You need to know how to add, subtract, and multiply decimals to figure out your correct change. Also, it helps if you can also know how much to tip your waiter. Since almost all cell phones have a calculator or tip calculator, it doesn't really matter as much to know how to use decimals, but it can be helpful. As for me, I usually use my phone's calculator because I do enough math at school daily. Also, decimals on reciepts, house designer draft paper, math questions adults give you, and grocery prices!
You can use decimal models to add decimals by using the hundedths blocks as used in base-ten blocks and add the following decimals you need to and use the hundredths block to shade in the total.
without decimals you wouldn't be able to figure out how much money you have, you wouldn't be able to get exact temperature you would have to round it off.