# Doubles

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.

The visual anchors we use for 7+7 and 8+8 aren’t, in my experience, as strong as the others.  For these, I’ve come to prefer early work on a doubles plus 2 strategy.  For instance,  once students know 6+6=12, then I start to ask that fact right before asking 7+7.  Most students can see that adding 2 to the 6+6 fact can let them find the answer and provide a scaffold.

 Doubles Posters These letter size pages show various visual references for the doubles facts.  One image per letter size page. Doubles Flash Cards These cards are set two per page and useful for the teacher to show during mental / oral math time. Student Doubles Flash Cards These cards are set four per page, and useful for students working together, classroom activities, or take home math activities. Last One to School This game from The Guide To Technical Instruction has students practice their doubles in pairs, using ten sided dice or cards. Doubles in a row This is a game where students try to get three in a row  by doubling a dice roll. Two of Everything This is a great book for exploring doubles.