The warm-up in this lesson serves as a review of previously learned concepts such as the commutative property and distributive property.
Students use the distributive property by breaking down the number multiplied by eight into two parts: five plus a number. They then write 40 for 8 x 5 and add to it the remaining fact.
Yes, students are encouraged to use any method or property they have learned, such as commutative property, distributive property, doubles, skip counting by finger model, or known facts.