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Number Theory

Level 24 / mastery

Rules - even (4, 6, 8)

3 visual steps / divisibility rule

1. Last three

divisible? 728 by 81. Last threelast three digits 728.1last three digits 72828 x 91 = 7283answer yes
last three digits 728.

last three digits 728.

2. Exact multiple

divisible? 728 by 82. Exact multiple8 x 91 = 728.1last three digits 72828 x 91 = 7283answer yes
8 x 91 = 728.

8 x 91 = 728.

3. Answer yes

divisible? 728 by 83. Answer yesanswer yes. Read answer answer yesanswer yes.
answer yes.

answer yes.

Practice Level 24

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

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