medium Set 81 Form Exercise

Number Chain: 10 → +9 → -1 → -17 → x5 → ?

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Answer: 5

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":9}
  • {"op":"-","operand":1}
  • {"op":"-","operand":17}
  • {"op":"x","operand":5}
Difficulty
medium

Number Chain: 8 → -6 → x5 → +5 → x5 → ?

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Answer: 75

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":6}
  • {"op":"x","operand":5}
  • {"op":"+","operand":5}
  • {"op":"x","operand":5}
Difficulty
medium

Number Chain: 4 → -1 → x3 → x5 → -2 → ?

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Answer: 43

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"x","operand":5}
  • {"op":"-","operand":2}
Difficulty
medium

Number Chain: 1 → +7 → +1 → x3 → x4 → ?

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Answer: 108

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":7}
  • {"op":"+","operand":1}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
Difficulty
medium

Number Chain: 5 → +10 → -6 → +4 → x3 → ?

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Answer: 39

SubType
number-chain
Start
5
Steps
  • {"op":"+","operand":10}
  • {"op":"-","operand":6}
  • {"op":"+","operand":4}
  • {"op":"x","operand":3}
Difficulty
medium

Number Chain: 10 → x2 → x4 → -24 → x5 → ?

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Answer: 280

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":4}
  • {"op":"-","operand":24}
  • {"op":"x","operand":5}
Difficulty
medium

Number Chain: 10 → x4 → x3 → x2 → -42 → ?

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Answer: 198

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
  • {"op":"x","operand":2}
  • {"op":"-","operand":42}
Difficulty
medium

Number Chain: 8 → +4 → -2 → -7 → +2 → ?

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Answer: 5

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":4}
  • {"op":"-","operand":2}
  • {"op":"-","operand":7}
  • {"op":"+","operand":2}
Difficulty
medium