Learn the big friends formula for addition and Subtraction using abacus.
It is explained in detail in this video. Watch it till the end for proper understanding.
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Subtraction using Big Friends on Abacus
Small Friends on Abacus
Addition using Small Friends
Subtraction using Small Friends
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Addition using Big Friends on Abacus free printable Abacus practice worksheet
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Subtraction using Big Friends on Abacus free printable Abacus practice worksheet
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