Divisibility

• 1. The divisors and multiples of natural numbers (review) 10
• 2. Look at the remainder 15
• 3. The divisibility of the sum, the difference and the product 19
• 4. Rules of divisibility 27
• 5. Divisibility based on the sum of the digits 34
• 6. Further divisibility rules 38
• 7. Primes and compound numbers 42
• 8. Writing compound numbers as the product of primes 46
• 9. Common divisors, greatest common divisor 50
• 10. Common multiples, lowest common multiple 55
• 11. Mixed exercises 59