Addition, Subtraction, Multiplication & Division

Addition & Subtraction

Students create different models (e.g., number lines, cubes) for addition & subtraction problem types (e.g., join change unknown).

Sums Investigation

Students use their prior knowledge of addition to fluently find the sum of two numbers given to them. They demonstrate their strategies of addition problems as well as explain them to their peers amongst their groups.


Children use their understanding of various addition strategies to compare and contrast each one that group members utilize when solving for a sum.

How many are hiding? (Subtraction)

Children will be able to find the missing “part” number using the numbers 1-20 and show a number sentence in different ways.

Multiplication & Division

Students match various multiplication and division story problems to models that represent those problems and then they match each problem & model to the conceptual meaning of multiplication or division (e.g., multiplication as grouping; division as sharing)

 Ice Cream Scoop (Multiplication)

Students interpret a multiplication problem situation, in the context of ice cream scoops, using pictures, objects, words, numbers, and equations. They come to understand that repeated addition and skip counting are strategies for finding a product.