hard Set 31 Form Exercise

Number Chain: 12 → +6 → -12 → x3 → -6 → x5 → ?

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Answer: 60

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":6}
  • {"op":"-","operand":12}
  • {"op":"x","operand":3}
  • {"op":"-","operand":6}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 9 → -3 → -3 → x4 → -4 → x5 → ?

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Answer: 40

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":3}
  • {"op":"-","operand":3}
  • {"op":"x","operand":4}
  • {"op":"-","operand":4}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 7 → x3 → +6 → -26 → -1 → x5 → ?

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":3}
  • {"op":"+","operand":6}
  • {"op":"-","operand":26}
  • {"op":"-","operand":1}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 1 → +7 → x2 → -2 → +5 → +3 → ?

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Answer: 22

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":7}
  • {"op":"x","operand":2}
  • {"op":"-","operand":2}
  • {"op":"+","operand":5}
  • {"op":"+","operand":3}
Difficulty
hard

Number Chain: 8 → x4 → +8 → x2 → +12 → x5 → ?

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Answer: 460

SubType
number-chain
Start
8
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":8}
  • {"op":"x","operand":2}
  • {"op":"+","operand":12}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 1 → -1 → -1 → +7 → +12 → +11 → ?

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Answer: 29

SubType
number-chain
Start
1
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"+","operand":7}
  • {"op":"+","operand":12}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 11 → -7 → +4 → -3 → -2 → -1 → ?

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Answer: 2

SubType
number-chain
Start
11
Steps
  • {"op":"-","operand":7}
  • {"op":"+","operand":4}
  • {"op":"-","operand":3}
  • {"op":"-","operand":2}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 4 → -3 → x5 → +8 → -5 → x3 → ?

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Answer: 24

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