standard_description: Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.
problem_activity: Problem 3
Pre-unit
Find the value of each sum or difference.
\(374 + 455\)
\(259 - 186\)


aligns: no