hard Set 80 Form Exercise

Number Chain: 5 → -2 → -2 → x3 → x4 → +3 → ?

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Answer: 15

SubType
number-chain
Start
5
Steps
  • {"op":"-","operand":2}
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"+","operand":3}
Difficulty
hard

Number Chain: 11 → -6 → +3 → x5 → x2 → x2 → ?

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Answer: 160

SubType
number-chain
Start
11
Steps
  • {"op":"-","operand":6}
  • {"op":"+","operand":3}
  • {"op":"x","operand":5}
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 4 → -2 → x3 → x2 → x4 → x4 → ?

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Answer: 192

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

Number Chain: 4 → +3 → x2 → +12 → x3 → -22 → ?

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Answer: 56

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":3}
  • {"op":"x","operand":2}
  • {"op":"+","operand":12}
  • {"op":"x","operand":3}
  • {"op":"-","operand":22}
Difficulty
hard

Number Chain: 4 → -1 → +8 → -3 → +5 → +11 → ?

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Answer: 24

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":8}
  • {"op":"-","operand":3}
  • {"op":"+","operand":5}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 12 → x5 → x4 → x4 → +10 → -254 → ?

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Answer: 716

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":5}
  • {"op":"x","operand":4}
  • {"op":"x","operand":4}
  • {"op":"+","operand":10}
  • {"op":"-","operand":254}
Difficulty
hard

Number Chain: 12 → x3 → x2 → x2 → -64 → x3 → ?

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Answer: 240

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
  • {"op":"-","operand":64}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 4 → -2 → x3 → +1 → x5 → x2 → ?

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Answer: 70

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":1}
  • {"op":"x","operand":5}
  • {"op":"x","operand":2}
Difficulty
hard