Question

give the formula for the abacus

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Answer 1

Answer:

the divisibility of the following numbers by 11 example 377

Answer 2

Answer:

Use the formula 'Less 10 add 3'. Now add 3 (slide up the 3 lower beads of unit place) and remove 10 (slide down the lower bead of value 10 columns). We are left with (1 upper bead and 3 lower beads of unit's place). The solution is 5 + 3 = 8, which is our answer.

Step-by-step explanation:

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