hard Set 89 Form Exercise

Number Chain: 3 → +4 → +12 → x5 → +11 → x2 → ?

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Answer: 212

SubType
number-chain
Start
3
Steps
  • {"op":"+","operand":4}
  • {"op":"+","operand":12}
  • {"op":"x","operand":5}
  • {"op":"+","operand":11}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 1 → -1 → -1 → -1 → +9 → +6 → ?

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Answer: 13

SubType
number-chain
Start
1
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"+","operand":9}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 10 → x2 → -6 → +11 → +11 → +6 → ?

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Answer: 42

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":2}
  • {"op":"-","operand":6}
  • {"op":"+","operand":11}
  • {"op":"+","operand":11}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 4 → +2 → +2 → x2 → +5 → +6 → ?

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Answer: 27

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

Number Chain: 2 → x5 → -2 → -2 → -1 → +1 → ?

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Answer: 6

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

Number Chain: 2 → x5 → -2 → -4 → -3 → x4 → ?

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Answer: 4

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

Number Chain: 2 → x2 → +6 → x5 → +3 → -30 → ?

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Answer: 23

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":6}
  • {"op":"x","operand":5}
  • {"op":"+","operand":3}
  • {"op":"-","operand":30}
Difficulty
hard

Number Chain: 5 → x2 → x5 → +7 → +8 → +5 → ?

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Answer: 70

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":5}
  • {"op":"+","operand":7}
  • {"op":"+","operand":8}
  • {"op":"+","operand":5}
Difficulty
hard