Let’s solve each abacus problem step by step.
An abacus has three rods:
- The
rightmost rod is for
ones (units)
- The
middle rod is for
tens
- The
leftmost rod is for
hundreds
We count the beads on each rod and write the number as:
> Hundreds + Tens + Ones = Total Number
---
First Abacus (Top Left):
- Hundreds rod: 1 bead → 100
- Tens rod: 2 beads → 20
- Ones rod: 1 bead → 1
→ 100 + 20 + 1 =
121
---
Second Abacus (Top Right):
- Hundreds rod: 1 bead → 100
- Tens rod: 5 beads → 50
- Ones rod: 3 beads → 3
→ 100 + 50 + 3 =
153
---
Third Abacus (Middle Left):
- Hundreds rod: 1 bead → 100
- Tens rod: 3 beads → 30
- Ones rod: 1 bead → 1
→ 100 + 30 + 1 =
131
---
Fourth Abacus (Middle Right):
- Hundreds rod: 1 bead → 100
- Tens rod: 6 beads → 60
- Ones rod: 0 beads → 0
→ 100 + 60 + 0 =
160
---
Fifth Abacus (Bottom Left):
- Hundreds rod: 1 bead → 100
- Tens rod: 4 beads → 40
- Ones rod: 5 beads → 5
→ 100 + 40 + 5 =
145
---
Sixth Abacus (Bottom Right):
- Hundreds rod: 1 bead → 100
- Tens rod: 0 beads → 0
- Ones rod: 0 beads → 0
→ 100 + 0 + 0 =
100
---
Final Answer:
121, 153, 131, 160, 145, 100
Parent Tip: Review the logic above to help your child master the concept of abacus worksheet.
