# 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.

For Example:

1. Take the number 10

 10 = 1 bead on tens rodand 0 beads on ones rodThus, 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 rodand 1 bead on ones rodThus, 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 rodand 5 beads on ones rodThus, 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 rodand 5 beads on ones rodThus, 55 = 5 tens and 5 ones.This is the expanded form of 55.

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

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