Maths

• An odd number is any non-zero integer whose remainder, upon division by two, is one.
• A prime number is an integer greater than one that has no positive divisors other than one and itself.
• There are infinitely many prime numbers, a theorem proved by Euclid.
• The number 2 is the only even prime number.
• A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
• The product of two numbers is the result when they are multiplied together.

  
• Common multiples are numbers which both numbers divide into exactly.
• 8 × ? = ?


  - 8 × 9 = 72
• 5 × ? = ?


  - 5 × 4 = 20
• 2 × ? = ?


  - 2 × 3 = 6