hard Set 75 Form Exercise

Number Chain: 7 → x2 → x2 → -19 → -5 → -1 → ?

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Answer: 3

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
  • {"op":"-","operand":19}
  • {"op":"-","operand":5}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 5 → +11 → +9 → x4 → +4 → +2 → ?

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Answer: 106

SubType
number-chain
Start
5
Steps
  • {"op":"+","operand":11}
  • {"op":"+","operand":9}
  • {"op":"x","operand":4}
  • {"op":"+","operand":4}
  • {"op":"+","operand":2}
Difficulty
hard

Number Chain: 8 → x3 → x3 → -37 → +12 → -31 → ?

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Answer: 16

SubType
number-chain
Start
8
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":3}
  • {"op":"-","operand":37}
  • {"op":"+","operand":12}
  • {"op":"-","operand":31}
Difficulty
hard

Number Chain: 1 → -1 → x4 → +4 → x5 → +1 → ?

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Answer: 21

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

Number Chain: 4 → -3 → -1 → x3 → +4 → x2 → ?

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Answer: 8

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

Number Chain: 12 → x4 → +1 → +6 → x2 → -70 → ?

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Answer: 40

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":1}
  • {"op":"+","operand":6}
  • {"op":"x","operand":2}
  • {"op":"-","operand":70}
Difficulty
hard

Number Chain: 1 → -1 → -1 → +11 → x3 → -20 → ?

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Answer: 10

SubType
number-chain
Start
1
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"+","operand":11}
  • {"op":"x","operand":3}
  • {"op":"-","operand":20}
Difficulty
hard

Number Chain: 4 → +8 → +10 → +9 → x5 → -20 → ?

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Answer: 135

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":8}
  • {"op":"+","operand":10}
  • {"op":"+","operand":9}
  • {"op":"x","operand":5}
  • {"op":"-","operand":20}
Difficulty
hard