options: 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.

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.

Use place value understanding to round whole numbers to the nearest 10 or 100.
problem_activity: Problem 3
Pre-unit
Find the value of each sum or difference.
\(374 + 455\)
\(259 - 186\)


correct_option_index: 0