Arithmetic Number Puzzle (Performance Task 1.1)

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123456789101112
Across
  1. 1. 60, 64, 68,... What is the 50th term?
  2. 4. 2, 4, 6,... Find the sum of the first 100 terms.
  3. 6. 119, 117, 115,... What is the 20th term?
  4. 8. If 3x + 2 is the arithmetic mean between x + 4 and 5x + 8, find the value of x.
  5. 10. Find the first term given Sn = 240, n = 10, and the last term is 66.
  6. 11. Find the last term given Sn = 190, first term = 5, and n = 10.
  7. 12. a(n) = 3n + 2, What is the 3rd term?
Down
  1. 2. First = 20, Last term = 100, n = 9, Find the sum.
  2. 3. 11, 15, 19,... What is the sum of first 20 terms?
  3. 4. 10, 6, 2,... What is the 7th term?
  4. 5. First term = 4, d = 9, what is a(17)?
  5. 7. Find n given Sn = 96, first term = 4, and last term = 20.
  6. 9. First term = 1, last term = 49, n = 25, Find the sum of first 25 terms.
  7. 11. First term = 10, d = 7, Find the 4th arithmetic mean between the first and last term of 6 terms.
  8. 12. First term = 15, d = –2, how many terms are there when the last term is - 7?