Page 145 - New Medley 4 Semester 1

4. Read the number from abacus. This is the required difference.

Suppose the subtraction sum card we picked reads as:

TTh Th H T O
3 3 7 6 4
1 0 2 4 1

Number at top is 33764.

It is represented on the abacus as:

TTh Th H T O

Number below is 10241.

We take out one green ring, four red rings and two blue rings and three

yellow rings.

TTh Th H T O

Now the abacus looks as:

TTh Th H T O

The answer is 23523.

5. Now repeat the process with another card.

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