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G4-2) NUMBER SEQUENCES

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  • Write a multiple of 5 greater than 5 less than 30 that is also a factor of 30
    10 or 15
  • -50, 150
  • -1, -9
  • Is 43 a composite number? Explain.
    No. It has only 2 factors.
  • Tom counts back in 4s starting at 17. Write down the first two numbers less than 0 that Tom will count.
    -3, -7
  • 25, 36, 49 (next) square numbers
  • Tom says, '1 is not a prime number nor a composite number.' Do you agree with Tom? Explain.
    Yes. 1 has only 1 factor. A prime number has 2 factors. A composite number has more than 2 factors.
  • Two consecutive triangular numbers total a square number. Give two examples to make this statement true.
    1 + 3 = 4, 3 + 6 = 9
  • -7
  • 64
  • Any multiple of 100 is a multiple of 25. Is this statement true or false? Explain.
    The smallest multiple of 100 is 100. 100 is a multiple of 25.
  • 15, 21, 28 (next) triangular numbers
  • 7
  • 16.5, 13.5, 7.5
  • 27
  • Is 1 a prime number? Explain.
    No. It has only 1 factor.
  • 36 + 64 = 100
  • 17, 19, 23, 29
  • Across: 5, 5 - Down: 3, 3
  • 10 (add 4 dots to the third shape)
  • a) 3, 5, 37 - b) 2, 43
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