Unit: Addition, subtraction, and estimation
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Possible mastery points
About this unitAddition and subtraction are key skills for any math whiz. In this unit, you'll sharpen those skills by working with multi-digit numbers. You'll also learn how to round and estimate, so you can quickly make calculations even when you don't have a calculator handy.
Up next for you:Level up on all the skills in this unit and collect up to 500 Mastery points!