Number Theory Level 5: Divisibility intro (2, 3, 5). divisibility rule.
1. Read last digit
Use the rule for the selected divisor; do not trial-divide blindly.
Select the digits or multiple required by this divisor.
2. Check 0 or 5
Read last digit
Apply the selected rule exactly.
3. Read yes or no
Read last digit
Check 0 or 5
Yes
Read the divisibility relation and its semantic answer.