hard Set 53 Form Exercise

Number Chain: 7 → -5 → x4 → x2 → +12 → x5 → ?

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Answer: 140

SubType
number-chain
Start
7
Steps
  • {"op":"-","operand":5}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"+","operand":12}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 2 → +2 → -1 → -2 → +7 → +11 → ?

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Answer: 19

SubType
number-chain
Start
2
Steps
  • {"op":"+","operand":2}
  • {"op":"-","operand":1}
  • {"op":"-","operand":2}
  • {"op":"+","operand":7}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 2 → +6 → +6 → +9 → x2 → x3 → ?

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Answer: 138

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

Number Chain: 7 → -2 → +2 → x4 → -12 → -10 → ?

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Answer: 6

SubType
number-chain
Start
7
Steps
  • {"op":"-","operand":2}
  • {"op":"+","operand":2}
  • {"op":"x","operand":4}
  • {"op":"-","operand":12}
  • {"op":"-","operand":10}
Difficulty
hard

Number Chain: 7 → +10 → +7 → x3 → +3 → +3 → ?

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Answer: 78

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":10}
  • {"op":"+","operand":7}
  • {"op":"x","operand":3}
  • {"op":"+","operand":3}
  • {"op":"+","operand":3}
Difficulty
hard

Number Chain: 7 → -2 → x3 → -14 → +2 → -1 → ?

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Answer: 2

SubType
number-chain
Start
7
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"-","operand":14}
  • {"op":"+","operand":2}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 12 → -6 → +10 → +12 → +2 → -9 → ?

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Answer: 21

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":6}
  • {"op":"+","operand":10}
  • {"op":"+","operand":12}
  • {"op":"+","operand":2}
  • {"op":"-","operand":9}
Difficulty
hard

Number Chain: 12 → x2 → x5 → x3 → -125 → -145 → ?

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Answer: 90

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"-","operand":125}
  • {"op":"-","operand":145}
Difficulty
hard