medium Set 31 Form Exercise

Number Chain: 3 → x2 → +2 → -4 → x4 → ?

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Answer: 16

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

Number Chain: 2 → -1 → x3 → +3 → -1 → ?

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Answer: 5

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

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

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Answer: 45

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

Number Chain: 10 → +7 → -16 → x5 → x2 → ?

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Answer: 10

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":7}
  • {"op":"-","operand":16}
  • {"op":"x","operand":5}
  • {"op":"x","operand":2}
Difficulty
medium

Number Chain: 9 → +5 → +1 → x2 → -2 → ?

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Answer: 28

SubType
number-chain
Start
9
Steps
  • {"op":"+","operand":5}
  • {"op":"+","operand":1}
  • {"op":"x","operand":2}
  • {"op":"-","operand":2}
Difficulty
medium

Number Chain: 6 → +10 → +5 → x3 → -38 → ?

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Answer: 25

SubType
number-chain
Start
6
Steps
  • {"op":"+","operand":10}
  • {"op":"+","operand":5}
  • {"op":"x","operand":3}
  • {"op":"-","operand":38}
Difficulty
medium

Number Chain: 8 → -7 → -1 → x2 → +1 → ?

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Answer: 1

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":7}
  • {"op":"-","operand":1}
  • {"op":"x","operand":2}
  • {"op":"+","operand":1}
Difficulty
medium

Number Chain: 10 → -8 → -1 → +5 → x5 → ?

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Answer: 30

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":8}
  • {"op":"-","operand":1}
  • {"op":"+","operand":5}
  • {"op":"x","operand":5}
Difficulty
medium