hard Set 63 Form Exercise

Number Chain: 9 → -7 → x4 → +8 → -9 → -1 → ?

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Answer: 6

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":7}
  • {"op":"x","operand":4}
  • {"op":"+","operand":8}
  • {"op":"-","operand":9}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 7 → -6 → x4 → x5 → +4 → -6 → ?

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Answer: 18

SubType
number-chain
Start
7
Steps
  • {"op":"-","operand":6}
  • {"op":"x","operand":4}
  • {"op":"x","operand":5}
  • {"op":"+","operand":4}
  • {"op":"-","operand":6}
Difficulty
hard

Number Chain: 11 → +7 → +2 → -4 → x2 → +10 → ?

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Answer: 42

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":7}
  • {"op":"+","operand":2}
  • {"op":"-","operand":4}
  • {"op":"x","operand":2}
  • {"op":"+","operand":10}
Difficulty
hard

Number Chain: 5 → -2 → x3 → -1 → +4 → x2 → ?

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Answer: 24

SubType
number-chain
Start
5
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"-","operand":1}
  • {"op":"+","operand":4}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 10 → -3 → +3 → +1 → -6 → +9 → ?

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Answer: 14

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":3}
  • {"op":"+","operand":3}
  • {"op":"+","operand":1}
  • {"op":"-","operand":6}
  • {"op":"+","operand":9}
Difficulty
hard

Number Chain: 10 → +4 → -6 → +5 → x3 → +9 → ?

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Answer: 48

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":4}
  • {"op":"-","operand":6}
  • {"op":"+","operand":5}
  • {"op":"x","operand":3}
  • {"op":"+","operand":9}
Difficulty
hard

Number Chain: 12 → x3 → -7 → x5 → x2 → -28 → ?

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Answer: 262

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":7}
  • {"op":"x","operand":5}
  • {"op":"x","operand":2}
  • {"op":"-","operand":28}
Difficulty
hard

Number Chain: 2 → x2 → +6 → x3 → x2 → -30 → ?

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Answer: 30

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":6}
  • {"op":"x","operand":3}
  • {"op":"x","operand":2}
  • {"op":"-","operand":30}
Difficulty
hard