Third grade math students use strategies and algorithms based on place value, properties of operations, and the relationship between addition and subtraction to fluently add within 1,000. CCSS3.NBT.A.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. CCSS4.NBT.B.4 Fluently add and subtract multi-digit whole numbers using the standard algorithm. Use for Practice sheetQu