hard Set 68 Form Exercise

Number Chain: 6 → x4 → -12 → x2 → +6 → -13 → ?

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Answer: 17

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":4}
  • {"op":"-","operand":12}
  • {"op":"x","operand":2}
  • {"op":"+","operand":6}
  • {"op":"-","operand":13}
Difficulty
hard

Number Chain: 10 → -2 → -2 → -4 → -1 → +9 → ?

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Answer: 10

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":2}
  • {"op":"-","operand":2}
  • {"op":"-","operand":4}
  • {"op":"-","operand":1}
  • {"op":"+","operand":9}
Difficulty
hard

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

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Answer: 4

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

Number Chain: 2 → -1 → +5 → x5 → -25 → +11 → ?

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Answer: 16

SubType
number-chain
Start
2
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":5}
  • {"op":"x","operand":5}
  • {"op":"-","operand":25}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 3 → x5 → +7 → -9 → x4 → +7 → ?

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Answer: 59

SubType
number-chain
Start
3
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":7}
  • {"op":"-","operand":9}
  • {"op":"x","operand":4}
  • {"op":"+","operand":7}
Difficulty
hard

Number Chain: 9 → +12 → +3 → x5 → -100 → +10 → ?

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Answer: 30

SubType
number-chain
Start
9
Steps
  • {"op":"+","operand":12}
  • {"op":"+","operand":3}
  • {"op":"x","operand":5}
  • {"op":"-","operand":100}
  • {"op":"+","operand":10}
Difficulty
hard

Number Chain: 6 → +10 → +8 → +3 → -7 → x4 → ?

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Answer: 80

SubType
number-chain
Start
6
Steps
  • {"op":"+","operand":10}
  • {"op":"+","operand":8}
  • {"op":"+","operand":3}
  • {"op":"-","operand":7}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 4 → +12 → -7 → x4 → x5 → -71 → ?

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Answer: 109

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":12}
  • {"op":"-","operand":7}
  • {"op":"x","operand":4}
  • {"op":"x","operand":5}
  • {"op":"-","operand":71}
Difficulty
hard