2-Digit Numbers on an Abacus

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.

Abacus

For Example:

1. Take the number 10

Ten

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.
Number 10 on Abacus

The number can be written in words as ten.


2. Take the number 21

Twenty-one

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.
Number 21 on Abacus

The number can be written in words as twenty-one.


3. Take the number 35

Thirty-five

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.
Number 35 on Abacus

The number can be written in words as thirty-five.


4. Take the number 55.

Fifty-five

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.
Number 55 on Abacus

The number can be written in words as fifty-five.



2nd Grade Math Practice

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