3.NBT. Grade 3 - Number and Operations in Base Ten

3.NBT.A. Use place value understanding and properties of operations to perform multi-digit arithmetic.

3.NBT.A.1. Use place value understanding to round whole numbers to the nearest 10 or 100.

• Rounding to 50 or 500
• Rounding to the Nearest 100 and 1000
• Rounding to the Nearest Ten and Hundred

3.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.

• Classroom Supplies

3.NBT.A.3. Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., $9 \times 80$, $5 \times 60$) using strategies based on place value and properties of operations.

• How Many Colored Pencils?