20) Near Double
Doubling and Halving to 10: Strategy Fluency
Mathematics
To develop fluency using the strategy of near double addition, adding one more than the double bonds of 1, 2, 3, 4, 5.
Prior knowledge needed:
- Double 1, 2, 3, 4, 5 bonds
- The commutative property of addition: two parts can be added in any order without changing the size of the whole.
- The associative property of addition: three or more parts can be added in any order without changing the size of the whole.
Language
- double bond
- near double
- one more
- addition as “add”
- equals
Differentiation
A little easier
Sequence: step by step
Place Bond Blocks on the part-part-whole frame to calculate the near double part-part-part-whole bond. For example,
Working Memory Support: desk visual
Click to download the Double Bonds to 10 Part-Part-Whole Diagrams desk visual.
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.
A little harder
Activity 63
Students who have completed up to Ten Plus Bonds: Addition and Subtraction Ten and One can complete a similar activity for wholes in the teens. Complete Activity 63 Doubling and Halving to 20: Near Double Strategy Fluency.
Progression
In the next chapter of activities students develop different partitions for wholes less than 10. Go to
Activity 21
Five Plus Bonds: Bonds Building A Wall