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Math Gym
Number Theory Guide

Number Theory Level 23: Rules - small (2, 3, 4, 5). divisibility rule.

1. Read last two digits

1. Read last two digits
Use the rule for the selected divisor; do not trial-divide blindly.

Select the digits or multiple required by this divisor.

last two digits 24.

2. Check multiple of 4

2. Check multiple of 4
Read last two digits

Apply the selected rule exactly.

24 divisible by 4.

3. Read yes or no

3. Read yes or no
Read last two digits
Check multiple of 4
Yes

Read the divisibility relation and its semantic answer.

answer yes.