Here's a set of 10 total rounding worksheets with a ghostly theme (5 addition, 5 subtraction). Students add or subtract the two ghosts to find the real total. Once they have done that, they round each number in the problem to the nearest tens. Then, add or subtract to find the rounded total. Students then can compare the real total to the rounded total to see how close they came to one another.
**Included in this set are also the answer sheets for each page.**
This activity ties in with the 3rd Grade Common Core Standard 3.NBT.A.1: Use place value understanding to round whole numbers to the nearest 10 or 100.
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Sara @ Miss V's Busy Bees