We know about tens and ones. Now let us learn how to represent two digit numbers on an abacus.
What is an abacus?
An abacus is a tool or a toy for counting. An abacus which has two rods.
We are learning 2-digit numbers on an abacus so, this abacus has two rods: the tens rod and the ones rod. Each rod can have a maximum of nine beads.
For Example:
1. Take the number 10
10 = 1 bead on tens rod and 0 beads on ones rod Thus, 10 = 1 ten and 0 ones. This is the expanded form of 10. |
The number can be written in words as ten.
2. Take the number 21
21 = 2 beads on tens rod and 1 bead on ones rod Thus, 21 = 2 tens and 1 ones. This is the expanded form of 21. |
The number can be written in words as twenty-one.
3. Take the number 35
35 = 3 beads on tens rod and 5 beads on ones rod Thus, 35 = 3 tens and 5 ones. This is the expanded form of 35. |
The number can be written in words as thirty-five.
4. Take the number 55.
55 = 5 beads on tens rod and 5 beads on ones rod Thus, 55 = 5 tens and 5 ones. This is the expanded form of 55. |
The number can be written in words as fifty-five.
2nd Grade Math Practice
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