At this level, students describe, analyze and compare strategies for adding and subtracting, while working on accuracy and efficiency. They also develop an understanding of factors and multiples through work with array models of multiplication and practice multiplication combinations through 12 x 12. They develop strategies for solving multiplication and division problems based on looking at the problem as a whole, thinking about the relationships among the numbers in the problem and choosing an approach they can carry out easily and accurately. Students interpret and solve division problems both in story contexts and numerical contexts. Understanding numbers through 10,000 is extended with exploration of the structure of place value and the base-10 number system. Students learn the meaning, order and equivalencies of fractions and decimals, and continue to focus on the meaning of fractions, in a variety of contexts, as equal parts of a whole. They also relate decimals to equivalent decimals and fractions.

Students collect, represent, describe and interpret data, and they use graphs and tables to represent changes in data. They develop conclusions and make arguments based on the evidence they have collected. Students compare and predict the likelihood of events in their study of probability. They consider the various attributes of 2D shapes, such as the number of sides, the length of sides, parallel sides and the size of angles. Students describe attributes and properties of geometric solids (3D shapes), such as the shape and number of faces, the number and relative lengths of edges and the number of vertices. They also work on understanding the concept of volume and its measurement.