63) Near Double
Doubling and Halving to 20: Strategy Fluency
Mathematics
To develop fluency using the strategy of near double addition, adding one more than the double bonds of 6, 7, 8, 9.
Prior knowledge needed:
- Double 6, 7, 8, 9 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. For example,
Working Memory Support: desk visual
Click to download the Double Bonds to 20 Part-Part-Whole Diagrams desk visual.
Activity 20
Activity 20, Doubling and Halving to 10: Strategy Fluency is the same activity but for wholes up to 10. This is significantly easier.
Progression
After completing Bond Block activities to this point students have partitioned two-digit wholes to 20 using place value and double bonds. The next chapter of activities focuses on the remaining two-part, single-digit bonds. For example, 15 as 9 and 6. Go to
Activity 64
Bonds of 11 to 20: Addition, Lulu