Question

big friend formula of abacus​

Answer 1

Step-by-step explanation:

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I don't know....can you tell me?

Answer 2

Answer:

When there are not enough beads in a column to add on an Abacus, you can take the help of small friends and big friends. Small friends are numbers that add up to a total of 5. Big Friends are numbers that add up to a total of 10. ... Big Friends are numbers that add up to a total of 10.