3-Number+and+Operations+in+Base+Ten

1. Use place value understanding to round whole numbers to the nearest 10 or 100.
 * Use place value understanding and properties of operations to perform multi-digit arithmetic.1
 * Use place value understanding and properties of operations to perform multi-digit arithmetic.1

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.

3. Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations. _ 1 A range of algorithms may be used. ||