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Number Theory

Level 27 / mastery

Rule for 11

3 visual steps / divisibility rule

1. Alt sum

divisible? 918082 by 111. Alt sum9 - 1 + 8 - 0 + 8 - 2.19 - 1 + 8 - 0 + 8 - 22equals 223answer yes
9 - 1 + 8 - 0 + 8 - 2.

9 - 1 + 8 - 0 + 8 - 2.

2. Multiple of 11

divisible? 918082 by 112. Multiple of 11equals 22.19 - 1 + 8 - 0 + 8 - 22equals 223answer yes
equals 22.

equals 22.

3. Answer yes

divisible? 918082 by 113. Answer yesanswer yes. Read answer answer yesanswer yes.
answer yes.

answer yes.

Practice Level 27

Use the visible move, then type only when the answer is clear.

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