hard Set 71 Form Exercise

Number Chain: 7 → -1 → x4 → x2 → -9 → x5 → ?

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Answer: 195

SubType
number-chain
Start
7
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"-","operand":9}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 5 → +8 → x4 → +9 → +12 → x5 → ?

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Answer: 365

SubType
number-chain
Start
5
Steps
  • {"op":"+","operand":8}
  • {"op":"x","operand":4}
  • {"op":"+","operand":9}
  • {"op":"+","operand":12}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 9 → -5 → x4 → -7 → -4 → x2 → ?

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Answer: 10

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":5}
  • {"op":"x","operand":4}
  • {"op":"-","operand":7}
  • {"op":"-","operand":4}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 8 → +2 → x3 → +4 → -9 → +6 → ?

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Answer: 31

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":4}
  • {"op":"-","operand":9}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 8 → x3 → -9 → +10 → x3 → +10 → ?

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Answer: 85

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

Number Chain: 11 → x2 → -7 → -4 → x5 → +10 → ?

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Answer: 65

SubType
number-chain
Start
11
Steps
  • {"op":"x","operand":2}
  • {"op":"-","operand":7}
  • {"op":"-","operand":4}
  • {"op":"x","operand":5}
  • {"op":"+","operand":10}
Difficulty
hard

Number Chain: 5 → -4 → +6 → +7 → -9 → -1 → ?

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Answer: 4

SubType
number-chain
Start
5
Steps
  • {"op":"-","operand":4}
  • {"op":"+","operand":6}
  • {"op":"+","operand":7}
  • {"op":"-","operand":9}
  • {"op":"-","operand":1}
Difficulty
hard

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

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Answer: 6

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