hard Set 86 Form Exercise

Number Chain: 12 → +8 → -2 → -10 → +2 → -1 → ?

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Answer: 9

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":8}
  • {"op":"-","operand":2}
  • {"op":"-","operand":10}
  • {"op":"+","operand":2}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 12 → +3 → x2 → +11 → x5 → +5 → ?

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Answer: 210

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":3}
  • {"op":"x","operand":2}
  • {"op":"+","operand":11}
  • {"op":"x","operand":5}
  • {"op":"+","operand":5}
Difficulty
hard

Number Chain: 6 → x5 → +10 → x2 → +3 → x2 → ?

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Answer: 166

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":10}
  • {"op":"x","operand":2}
  • {"op":"+","operand":3}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 7 → x5 → -27 → -3 → -4 → -1 → ?

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":27}
  • {"op":"-","operand":3}
  • {"op":"-","operand":4}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 2 → -1 → -1 → -1 → x3 → +12 → ?

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Answer: 9

SubType
number-chain
Start
2
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 9 → +11 → x3 → +4 → -12 → +9 → ?

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Answer: 61

SubType
number-chain
Start
9
Steps
  • {"op":"+","operand":11}
  • {"op":"x","operand":3}
  • {"op":"+","operand":4}
  • {"op":"-","operand":12}
  • {"op":"+","operand":9}
Difficulty
hard

Number Chain: 2 → +10 → x2 → -1 → +4 → x2 → ?

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Answer: 54

SubType
number-chain
Start
2
Steps
  • {"op":"+","operand":10}
  • {"op":"x","operand":2}
  • {"op":"-","operand":1}
  • {"op":"+","operand":4}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 10 → +5 → -8 → -1 → +11 → +3 → ?

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Answer: 20

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":5}
  • {"op":"-","operand":8}
  • {"op":"-","operand":1}
  • {"op":"+","operand":11}
  • {"op":"+","operand":3}
Difficulty
hard