The doubles are relatively easy to learn and can form a powerful anchor for the near-doubles and other facts. They are one of the earliest sets of facts students work on.
A key scaffold is a visual reference to the various double facts. For example, 3 + 3 is called the Bug Double. Most bugs have 3 legs on each side, and 6 in total, so it illustrates 3 + 3 = 6. These visual representations must satisfy two properties. First, the total must be evident to the student, such as a spider has eight legs.
Secondly, the representation must be innately composed of the two equal parts. A bug has 3 legs on each side, that’s just how they are. A set of two tricycles doesn’t meet this second condition – while the total is 6, tricycles don’t naturally come in groups of two.