medium Set 18 Form Exercise

Number Chain: 10 → +3 → -8 → x5 → -10 → ?

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Answer: 15

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":3}
  • {"op":"-","operand":8}
  • {"op":"x","operand":5}
  • {"op":"-","operand":10}
Difficulty
medium

Number Chain: 9 → -1 → +1 → x2 → -7 → ?

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Answer: 11

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":1}
  • {"op":"x","operand":2}
  • {"op":"-","operand":7}
Difficulty
medium

Number Chain: 10 → -5 → -3 → +2 → x3 → ?

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Answer: 12

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":5}
  • {"op":"-","operand":3}
  • {"op":"+","operand":2}
  • {"op":"x","operand":3}
Difficulty
medium

Number Chain: 5 → x4 → x3 → -19 → +3 → ?

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Answer: 44

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
  • {"op":"-","operand":19}
  • {"op":"+","operand":3}
Difficulty
medium

Number Chain: 4 → +5 → +10 → x4 → x4 → ?

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Answer: 304

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

Number Chain: 7 → +2 → -8 → +2 → x3 → ?

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Answer: 9

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":2}
  • {"op":"-","operand":8}
  • {"op":"+","operand":2}
  • {"op":"x","operand":3}
Difficulty
medium

Number Chain: 9 → x5 → +2 → +4 → x2 → ?

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Answer: 102

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":2}
  • {"op":"+","operand":4}
  • {"op":"x","operand":2}
Difficulty
medium

Number Chain: 5 → x5 → -24 → +6 → -5 → ?

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Answer: 2

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":24}
  • {"op":"+","operand":6}
  • {"op":"-","operand":5}
Difficulty
medium