About This Lesson
Students are required to come up with as many sums whose answers is ....In order to make it more difficult don't allow them to use add and subtract or s similar rule. Aligned with Common Core State Standards: 5.NBT.5, 6.EE.1 Expressions and Equations: Apply and extend previous understandings of arithmetic to algebraic expressions; 4.NBT.5, Number and Operations in Base Ten.
Pushes decomposition at many grade levels - nice!