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Math Gym
Number Theory Guide

Number Theory Level 27: Rule for 11. divisibility rule.

1. Alternate digit sum

1. Alternate digit sum
Use the rule for the selected divisor; do not trial-divide blindly.

Select the digits or multiple required by this divisor.

1 - 0 + 8 - 9.

2. Check multiple of 11

2. Check multiple of 11
Alternate digit sum

Apply the selected rule exactly.

equals 0.

3. Read yes or no

3. Read yes or no
Alternate digit sum
Check multiple of 11
Yes

Read the divisibility relation and its semantic answer.

answer yes.