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Number Theory

Level 28 / realistic untimed

Rule for 12

3 visual steps / divisibility rule

1. Check 3 and 4

divisible? 732 by 121. Check 3 and 4divisible by 3 and 4.1divisible by 3 and 42sum 12, last two 323answer yes
divisible by 3 and 4.

divisible by 3 and 4.

2. Both pass

divisible? 732 by 122. Both passsum 12, last two 32.1divisible by 3 and 42sum 12, last two 323answer yes
sum 12, last two 32.

sum 12, last two 32.

3. Answer yes

divisible? 732 by 123. Answer yesanswer yes. Read answer answer yesanswer yes.
answer yes.

answer yes.

Practice Level 28

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

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