3-digit Numbers on an Abacus

We already know about hundreds, tens and ones. Now let us learn how to represent 3-digit numbers on an abacus.

We know, an abacus is a tool or a toy for counting. An abacus which has three rods.

3-Digit Numbers on an Abacus

We are learning three digit numbers on an abacus so, this abacus has three rods: the hundreds rod, the tens rod and the ones rod. Each rod can have a maximum of nine beads.

For Example:

1. Take the number 270

Two Hundred and Seventy

2 beads on hundreds rod and 7 beads on tens rod and 0 beads on ones rod

270 on an Abacus

Thus, expanded form of 270 = 2 hundreds and 7 tens and 0 one.

The number can be written in words as: two hundred and seventy.


2. Take the number 422

Four Hundred and Twenty-two

4 beads on hundreds rod and 2 beads on tens rod and 2 beads on ones rod

422 on an Abacus

Thus, expanded form of 422 = 4 hundreds and 2 tens and 2 ones.

The number can be written in words as: four hundred and twenty-two.


3. Take the number 531

Five Hundred and Thirty-one

5 beads on hundreds rod and 3 beads on tens rod and 1 bead on ones rod

531 on an Abacus

Thus, expanded form of 531 = 5 hundreds and 3 tens and 1 one.

The number can be written in words as: five hundred and thirty-one.


4. Take the number 506.

Five Hundred and Six

5 beads on hundreds rod and 0 beads on tens rod and 6 beads on ones rod

506 on an Abacus

Thus, expanded form of 506 = 5 hundreds and 0 tens and 6 ones.

The number can be written in words as: five hundred and six.


USING AN ABACUS TO READ AND WRITE THE NUMBERS

The picture shown here is of an abacus. We may take the help of an abacus to read and write the numerals. This abacus has three spikes (vertical rods).

Blank Abacus

In each spike, we can put maximum 9 beads.

Three spikes show ones, tens and hundreds respectively. The abacus given on the right has 5 beads in ones place, 8 beads in the tens place and 6 beads in hundreds place. So, it shows the numeral 685.

685 on Abacus

We read it as six hundred eighty-five.

The place value chart for 685 is as given below:

Hundreds

Tens

Ones

6

8

5


Questions on 3-digit Numbers on an Abacus:

1. Draw beads on the spikes of the abacus to show the given numbers:

Draw Beads on the Spikes of the Abacus


2. Read the numbers shown on the abacus and fill in the placeholders. One has been done for you.

Numbers Shown on the Abacus


3. Fill in the placeholders with the missing digits. One has been done for you.

(i)

841

=

8

hundreds

4

tens

1

one

(ii)

620

=

___

hundreds

___

tens

___

one

(iii)

576

=

___

hundreds

___

tens

___

one

(iv)

702

=

___

hundreds

___

tens

___

one

(v)

800

=

___

hundreds

___

tens

___

one

(vi)

911

=

___

hundreds

___

tens

___

one



2nd Grade Math Practice

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