hard Set 98 Form Exercise

Number Chain: 11 → x2 → -18 → -2 → +3 → +7 → ?

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Answer: 12

SubType
number-chain
Start
11
Steps
  • {"op":"x","operand":2}
  • {"op":"-","operand":18}
  • {"op":"-","operand":2}
  • {"op":"+","operand":3}
  • {"op":"+","operand":7}
Difficulty
hard

Number Chain: 9 → -5 → -3 → -1 → +10 → -8 → ?

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Answer: 2

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":5}
  • {"op":"-","operand":3}
  • {"op":"-","operand":1}
  • {"op":"+","operand":10}
  • {"op":"-","operand":8}
Difficulty
hard

Number Chain: 2 → x3 → +9 → x3 → x4 → -117 → ?

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Answer: 63

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":3}
  • {"op":"+","operand":9}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"-","operand":117}
Difficulty
hard

Number Chain: 9 → x3 → x3 → -1 → -51 → -22 → ?

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Answer: 7

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":3}
  • {"op":"-","operand":1}
  • {"op":"-","operand":51}
  • {"op":"-","operand":22}
Difficulty
hard

Number Chain: 2 → -1 → x3 → x2 → +8 → x3 → ?

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Answer: 42

SubType
number-chain
Start
2
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"x","operand":2}
  • {"op":"+","operand":8}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 6 → x4 → +12 → +9 → -20 → -23 → ?

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Answer: 2

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":12}
  • {"op":"+","operand":9}
  • {"op":"-","operand":20}
  • {"op":"-","operand":23}
Difficulty
hard

Number Chain: 9 → x5 → -14 → -9 → -14 → +3 → ?

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Answer: 11

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":14}
  • {"op":"-","operand":9}
  • {"op":"-","operand":14}
  • {"op":"+","operand":3}
Difficulty
hard

Number Chain: 8 → x5 → -37 → x3 → -6 → +3 → ?

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Answer: 6

SubType
number-chain
Start
8
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":37}
  • {"op":"x","operand":3}
  • {"op":"-","operand":6}
  • {"op":"+","operand":3}
Difficulty
hard