Page 61 - Maths Class 02

4. Write the ten just before.

a. 150 156 b. 748 c. 423 d. 623

5. Write the hundred just before.

a. 683 b. 506 c. 890 d. 752

6. In 183, the place value of 8 is __________________________ .

7. In 254, the place value of 2 is __________________________ .

Learning Objective : To represent four digit number on abacus.

What You Need : 36 beads, an abacus with four spikes.

Preparation : Keep the abacus on a flat horizontal
surface, like a table. Starting from extreme right, label D C B A
these spikes as A, B, C and D as shown in the figure (a).

Spike A represents the ones place, spike B represents
the tens place, spike C represents the hundreds place

and spike D represents the thousands place.

Procedure :
Th H T O
Represent the number 2463 .
(a)
Step 1 : Put 3 beads on spike A to represent 3 ones.

Step 2 : Put beads on spike B to represent tens.6 6

Step 3 : Put beads on spike on C to represent 4 4 D C B A
hundreds.

Step 4 : Put 2 bead on spike D to represent 2
thousands.

Step 5 : 2 thousands + 4 hundreds + 6 tens + 3 ones
= 2463
Th H T O
Record the activity :
(b)
The abacus represents the number 2463 as shown in
figure ( ).b

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