standard_description: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)
problem_activity: Problem 1
Solve. Show or explain your work.
a.
$${91\div20}$$
b.
$${368\div50}$$
Problem 2
Use multiplication to check your answers to both problems in Problem 1.


aligns: no