hard Set 83 Form Exercise

Number Chain: 4 → +10 → -4 → x2 → -15 → x5 → ?

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Answer: 25

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":10}
  • {"op":"-","operand":4}
  • {"op":"x","operand":2}
  • {"op":"-","operand":15}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 1 → +10 → x2 → x4 → +4 → +8 → ?

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Answer: 100

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":10}
  • {"op":"x","operand":2}
  • {"op":"x","operand":4}
  • {"op":"+","operand":4}
  • {"op":"+","operand":8}
Difficulty
hard

Number Chain: 1 → -1 → +10 → +3 → -5 → x3 → ?

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Answer: 24

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

Number Chain: 4 → x2 → x5 → x3 → -29 → -54 → ?

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Answer: 37

SubType
number-chain
Start
4
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"-","operand":29}
  • {"op":"-","operand":54}
Difficulty
hard

Number Chain: 4 → -1 → -2 → -1 → +8 → x4 → ?

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Answer: 32

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":2}
  • {"op":"-","operand":1}
  • {"op":"+","operand":8}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 6 → x4 → +10 → -30 → +7 → -2 → ?

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Answer: 9

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":10}
  • {"op":"-","operand":30}
  • {"op":"+","operand":7}
  • {"op":"-","operand":2}
Difficulty
hard

Number Chain: 10 → x4 → -6 → x2 → -36 → +4 → ?

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Answer: 36

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":4}
  • {"op":"-","operand":6}
  • {"op":"x","operand":2}
  • {"op":"-","operand":36}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 12 → -1 → x5 → x3 → -149 → x2 → ?

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Answer: 32

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"-","operand":149}
  • {"op":"x","operand":2}
Difficulty
hard