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Number Theory

Level 26 / mastery

Rule for 7

3 visual steps / divisibility rule

1. Known multiple

divisible? 343 by 71. Known multiple7 x 49 = 343.17 x 49 = 3432exact multiple3answer yes
7 x 49 = 343.

7 x 49 = 343.

2. Exact multiple

divisible? 343 by 72. Exact multipleexact multiple.17 x 49 = 3432exact multiple3answer yes
exact multiple.

exact multiple.

3. Answer yes

divisible? 343 by 73. Answer yesanswer yes. Read answer answer yesanswer yes.
answer yes.

answer yes.

Practice Level 26

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

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