hard Set 20 Form Exercise

Number Chain: 4 → -2 → -1 → +12 → +5 → +4 → ?

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Answer: 22

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":2}
  • {"op":"-","operand":1}
  • {"op":"+","operand":12}
  • {"op":"+","operand":5}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 9 → x2 → -1 → -14 → +6 → -8 → ?

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Answer: 1

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":2}
  • {"op":"-","operand":1}
  • {"op":"-","operand":14}
  • {"op":"+","operand":6}
  • {"op":"-","operand":8}
Difficulty
hard

Number Chain: 2 → x2 → x4 → x2 → +11 → x2 → ?

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Answer: 86

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"+","operand":11}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 3 → x3 → -8 → -1 → x3 → -1 → ?

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Answer: -1

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

Number Chain: 2 → +11 → x2 → x5 → x3 → -385 → ?

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Answer: 5

SubType
number-chain
Start
2
Steps
  • {"op":"+","operand":11}
  • {"op":"x","operand":2}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"-","operand":385}
Difficulty
hard

Number Chain: 11 → +9 → x2 → x3 → +5 → -48 → ?

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Answer: 77

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":9}
  • {"op":"x","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":5}
  • {"op":"-","operand":48}
Difficulty
hard

Number Chain: 7 → x5 → x4 → x2 → +11 → x3 → ?

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Answer: 873

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":5}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"+","operand":11}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 6 → -5 → x5 → x3 → x4 → +2 → ?

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Answer: 62

SubType
number-chain
Start
6
Steps
  • {"op":"-","operand":5}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"+","operand":2}
Difficulty
hard