Abacusru4_1.les 782 Bytes
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Lesson 4.1: Subtraction
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This Lesson demonstrates subtracting 7 from 11

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Lesson 4.1: Subtraction (11-7)
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First Represent 11 as 10...
(pending operation)
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Lesson 4.1: Subtraction (11-7)
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...and 1.
(This is 11)
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Lesson 4.1: Subtraction (11-7)
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We Represent -7 as -10+3, so...

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Lesson 4.1: Subtraction (11-7)
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-10 ...
(pending operation +3)
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Lesson 4.1: Subtraction (11-7)
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...+3 Completes The Operation
The Answer is +4.
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Conclusion: (End)
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To perform addition, move beads towards the
position-beam; to subtract, move beads away from it.
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