We will illustrate this by doing 32 × 31. Lines are used to represent the numbers. 32 is represented by 3 red lines for the tens and 2 red lines for the units. Similarly, 31 has 3 lines for its tens and 1 line for units, this time the lines are blue.
Wherever the lines cross a dot is drawn and then the diagram is split into three parts as shown by the dashed lines. The number of dots in each
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