59) Fluency Halves

Doubling and Halving to 20: Filling a Wall

59.1 Fluency Halves Filling A Wall


Develop fluency with one half of the wholes 12, 14, 16, 18.

Prior knowledge of ten plus bonds and part-part-whole is required.


  • one half of
  • equals as “is”
  • double bond: a two-part bond, where both parts are the same


A little easier

Part-Part-Whole diagrams

Click to download the Double Bonds to 20 Part-Part-Whole Diagrams

These part-part-whole diagrams  can be stuck to the top of student’s desk, as a desk visual, until students are fluent recalling these facts. Students with memory or processing difficulties can benefit from having visuals as permanent prompts.

Click this link to read Teacher Notes for more ideas about “Using Part-Part-Whole Desk Visuals” to support students.

Activity 18

Activity 18, Doubling and Halving to 10: Fluency Halves Filling A Wall is the same activity but for wholes up to 10. This is significantly easier.


In the next two activities students continue to develop fluency with double bonds but do so without using the blocks. Go to

Activity 60

Doubling and Halving to 20: Fluency Doubles, Racing Kayaks