hard Set 17 Form Exercise

Number Chain: 8 → +8 → +12 → +9 → x2 → x3 → ?

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Answer: 222

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":8}
  • {"op":"+","operand":12}
  • {"op":"+","operand":9}
  • {"op":"x","operand":2}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 12 → -9 → -2 → x2 → -1 → x2 → ?

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Answer: 2

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":9}
  • {"op":"-","operand":2}
  • {"op":"x","operand":2}
  • {"op":"-","operand":1}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 7 → +8 → x3 → +8 → -46 → -6 → ?

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Answer: 1

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":8}
  • {"op":"x","operand":3}
  • {"op":"+","operand":8}
  • {"op":"-","operand":46}
  • {"op":"-","operand":6}
Difficulty
hard

Number Chain: 4 → -3 → -1 → x3 → -1 → +9 → ?

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Answer: 8

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

Number Chain: 12 → x4 → x5 → -192 → -14 → -16 → ?

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Answer: 18

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":5}
  • {"op":"-","operand":192}
  • {"op":"-","operand":14}
  • {"op":"-","operand":16}
Difficulty
hard

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

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Answer: -2

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

Number Chain: 1 → +7 → -7 → x3 → +4 → x3 → ?

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Answer: 21

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

Number Chain: 5 → +4 → +6 → -7 → x3 → +12 → ?

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Answer: 36

SubType
number-chain
Start
5
Steps
  • {"op":"+","operand":4}
  • {"op":"+","operand":6}
  • {"op":"-","operand":7}
  • {"op":"x","operand":3}
  • {"op":"+","operand":12}
Difficulty
hard