hard Set 87 Form Exercise

Number Chain: 2 → -1 → -1 → -1 → x4 → x3 → ?

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Answer: -12

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

Number Chain: 1 → x5 → +5 → x4 → -11 → +12 → ?

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Answer: 41

SubType
number-chain
Start
1
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":5}
  • {"op":"x","operand":4}
  • {"op":"-","operand":11}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 7 → +1 → +6 → +6 → -10 → +4 → ?

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Answer: 14

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":1}
  • {"op":"+","operand":6}
  • {"op":"+","operand":6}
  • {"op":"-","operand":10}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 10 → x5 → -17 → +8 → x2 → -54 → ?

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Answer: 28

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":17}
  • {"op":"+","operand":8}
  • {"op":"x","operand":2}
  • {"op":"-","operand":54}
Difficulty
hard

Number Chain: 5 → x3 → x5 → x2 → x3 → -269 → ?

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Answer: 181

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":5}
  • {"op":"x","operand":2}
  • {"op":"x","operand":3}
  • {"op":"-","operand":269}
Difficulty
hard

Number Chain: 7 → x3 → x4 → +12 → -94 → +6 → ?

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Answer: 8

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"+","operand":12}
  • {"op":"-","operand":94}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 12 → -5 → -6 → -1 → +11 → x2 → ?

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Answer: 22

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":5}
  • {"op":"-","operand":6}
  • {"op":"-","operand":1}
  • {"op":"+","operand":11}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 5 → x3 → x2 → +9 → +5 → x5 → ?

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Answer: 220

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