Common Core Math: Grade 3: Numbers in Base Ten
In third grade, students use the concept of place value as a basis for performing arithmetic with multi-digit numbers, including adding and subtracting within one thousand and multiplying one-digit numbers by multiples of 10. Students also round numbers to the nearest 10 or 100.
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Perform addition and subtraction.
Add whole numbers (CCSS.Math.Content.3.NBT.A.2):
Subtract whole numbers (CCSS.Math.Content.3.NBT.A.2):
Use place value to round whole numbers.
Round a number to a given place value (CCSS.Math.Content.3.NBT.A.1):