Lesson · L1
One-Rod Number Pairs
Best for guided progression in this stage of practice.
Core idea
Train easy one-rod pairs so direct movement feels clean before complements become necessary.
Saved on this device. Keep the path moving with one quiet next step.
Objectives
- Recognize friendly one-rod pairs that change shape but stay on the same rod.
- Build cleaner direct-add and direct-subtract confidence.
Reusable visual engine
Worked visual for One-Rod Number Pairs
Step 1
9Step 2
6Before complements, there are many friendly number pairs that can still live calmly on one rod.
Core idea
Pairs like 6 + 3 or 9 - 3 are useful because they change the bead shape, but the whole result still stays visible on one rod.
Practice habit
Read the starting value first, then the final value, instead of treating the middle movement as the whole problem.
Common mistakes
- Moving beads correctly but failing to re-read the final rod.
- Counting only the latest move and forgetting the whole value.
Previous lesson
First Subtraction on One Rod
Learn subtraction as careful removal, not rushed guessing.
Next lesson
Complements to Five
Use number pairs to move more efficiently on the soroban.
Related exercises
- Add three to six
This is a good early direct-addition drill because the value stays on one rod but still changes shape.
- Subtract three from nine
This reinforces that subtraction should still end with a clear rod reading, not just a guessed result.