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G5-2)Number Sequences, Special numbers, Multiple ...

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  • a) 13, 23 - b) 33, 63
  • -10, 10
  • 0.8, 0.73
  • 220
  • 6 x 15 = 90
  • Write all common factors of 18 and 30 which are greater than 1.
    2, 3, 6
  • Write all prime numbers up to 30.
    2, 3, 5, 7, 11, 13, 17, 19, 23, 29
  • -8
  • a) 2, 5, 23 or 2, 11, 17 - b) 2 because even+odd+odd=even and 2 is the only even prime number
  • 27, 64
  • a) 5 squared, 5x5, 25 - b) 7
  • 2
  • 64 + 64 = 128
  • -0.1
  • prime numbers / numbers with only 2 factors - 1 and themselves
  • 2 + 11 x 5
  • a) 48 or any multiple of 48 - b) 2 or 4
  • What is the difference between the third seventh number and the fourth cube number?
    15
  • -0.1
  • 7, 11, 23
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