hard Set 72 Form Exercise

Number Chain: 6 → -1 → +5 → +12 → +3 → -5 → ?

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Answer: 20

SubType
number-chain
Start
6
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":5}
  • {"op":"+","operand":12}
  • {"op":"+","operand":3}
  • {"op":"-","operand":5}
Difficulty
hard

Number Chain: 12 → -10 → +10 → +11 → x4 → x3 → ?

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Answer: 276

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":10}
  • {"op":"+","operand":10}
  • {"op":"+","operand":11}
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 5 → +5 → x4 → x3 → +9 → +3 → ?

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Answer: 132

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

Number Chain: 3 → -1 → +11 → -2 → +4 → +9 → ?

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Answer: 24

SubType
number-chain
Start
3
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":11}
  • {"op":"-","operand":2}
  • {"op":"+","operand":4}
  • {"op":"+","operand":9}
Difficulty
hard

Number Chain: 4 → +10 → -12 → +11 → +7 → x5 → ?

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Answer: 100

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":10}
  • {"op":"-","operand":12}
  • {"op":"+","operand":11}
  • {"op":"+","operand":7}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 5 → x3 → -3 → -8 → -2 → -1 → ?

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Answer: 1

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":3}
  • {"op":"-","operand":8}
  • {"op":"-","operand":2}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 7 → x3 → +8 → -9 → x3 → -53 → ?

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Answer: 7

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":3}
  • {"op":"+","operand":8}
  • {"op":"-","operand":9}
  • {"op":"x","operand":3}
  • {"op":"-","operand":53}
Difficulty
hard

Number Chain: 1 → x5 → x4 → -14 → -4 → x3 → ?

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Answer: 6

SubType
number-chain
Start
1
Steps
  • {"op":"x","operand":5}
  • {"op":"x","operand":4}
  • {"op":"-","operand":14}
  • {"op":"-","operand":4}
  • {"op":"x","operand":3}
Difficulty
hard