hard Set 42 Form Exercise

Number Chain: 11 → +8 → -10 → -5 → x4 → x5 → ?

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Answer: 80

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":8}
  • {"op":"-","operand":10}
  • {"op":"-","operand":5}
  • {"op":"x","operand":4}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 6 → x3 → -12 → +6 → -3 → x3 → ?

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Answer: 27

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":12}
  • {"op":"+","operand":6}
  • {"op":"-","operand":3}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 4 → -3 → +4 → -1 → x4 → x3 → ?

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Answer: 48

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":3}
  • {"op":"+","operand":4}
  • {"op":"-","operand":1}
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 3 → x4 → -3 → -8 → x4 → +10 → ?

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Answer: 14

SubType
number-chain
Start
3
Steps
  • {"op":"x","operand":4}
  • {"op":"-","operand":3}
  • {"op":"-","operand":8}
  • {"op":"x","operand":4}
  • {"op":"+","operand":10}
Difficulty
hard

Number Chain: 3 → -2 → -1 → -1 → -1 → +4 → ?

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Answer: 2

SubType
number-chain
Start
3
Steps
  • {"op":"-","operand":2}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 12 → -6 → -4 → +4 → +6 → +9 → ?

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Answer: 21

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

Number Chain: 2 → +1 → x4 → x3 → x4 → +2 → ?

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Answer: 146

SubType
number-chain
Start
2
Steps
  • {"op":"+","operand":1}
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"+","operand":2}
Difficulty
hard

Number Chain: 4 → x5 → +12 → -29 → x4 → +5 → ?

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Answer: 17

SubType
number-chain
Start
4
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":12}
  • {"op":"-","operand":29}
  • {"op":"x","operand":4}
  • {"op":"+","operand":5}
Difficulty
hard