Lesson · L0
Place Value on Two Rods
Best for
Best for reading structure accurately before moving into longer arithmetic drills.
1. Read the core idea 2. Study the worked example 3. Practice the related drills
Core idea
Move from single digits to two-digit numbers by respecting rod position.
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Saved on this device. Keep the path moving with one quiet next step.
Objectives
- Read tens and ones separately.
- Understand that rods have place value from right to left.
Reusable visual engine
Worked visual for Place Value on Two Rods
Step 1
24Step 2
20Each rod keeps its own digit, but its position changes the meaning.
Step by step for 24
- On the tens rod, set 2 lower beads to the beam. That means 20.
- On the ones rod, set 4 lower beads to the beam. That means 4.
- Read left to right: 20 + 4 = 24.
Common mistake
Reading each rod correctly but forgetting which rod is tens and which rod is ones.
Previous lesson
Reading a Single Digit
Read one soroban rod accurately before moving to larger numbers.
Next lesson
Setting Your First Numbers
Practice placing simple values cleanly and intentionally.
Related exercises
- Read the number twenty-four
Two active lower beads on the tens rod mean 20, and four active lower beads on the ones rod mean 4.
- Set the number thirty-one
Place value matters more than the total number of moved beads.