hard Set 30 Form Exercise

Number Chain: 4 → +1 → +6 → -6 → +2 → -5 → ?

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Answer: 2

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":1}
  • {"op":"+","operand":6}
  • {"op":"-","operand":6}
  • {"op":"+","operand":2}
  • {"op":"-","operand":5}
Difficulty
hard

Number Chain: 2 → +3 → x3 → -11 → x3 → x4 → ?

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Answer: 48

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

Number Chain: 4 → -3 → -1 → -1 → +8 → -2 → ?

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Answer: 5

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":3}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"+","operand":8}
  • {"op":"-","operand":2}
Difficulty
hard

Number Chain: 3 → -1 → x2 → -2 → -1 → +2 → ?

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Answer: 3

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

Number Chain: 2 → x4 → x4 → -24 → +6 → -4 → ?

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Answer: 10

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":4}
  • {"op":"-","operand":24}
  • {"op":"+","operand":6}
  • {"op":"-","operand":4}
Difficulty
hard

Number Chain: 7 → +2 → x2 → +2 → -7 → x5 → ?

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Answer: 65

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

Number Chain: 11 → +8 → -5 → x3 → -22 → +12 → ?

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Answer: 32

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":8}
  • {"op":"-","operand":5}
  • {"op":"x","operand":3}
  • {"op":"-","operand":22}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 12 → -10 → -1 → x5 → x3 → +6 → ?

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Answer: 21

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":10}
  • {"op":"-","operand":1}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"+","operand":6}
Difficulty
hard