A key part of the Dimensions Math curriculum—solving word problems using bar models—is thoroughly taught in 3rd grade. Bar modeling is central to how Singapore Math helps students break down and solve complex problems. If a student misses this foundational instruction, it can be difficult to pick up the concepts later on.

That’s why it’s recommended to begin by 3rd grade at the latest. If you’re starting after that, it’s a good idea to include some diagnostic work or catch-up support to build that missing foundation.