hard Set 79 Form Exercise

Number Chain: 1 → -1 → x3 → +3 → x5 → -3 → ?

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Answer: 12

SubType
number-chain
Start
1
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"+","operand":3}
  • {"op":"x","operand":5}
  • {"op":"-","operand":3}
Difficulty
hard

Number Chain: 7 → +7 → +9 → x5 → -12 → x4 → ?

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Answer: 412

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":7}
  • {"op":"+","operand":9}
  • {"op":"x","operand":5}
  • {"op":"-","operand":12}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 12 → x2 → -23 → -1 → +2 → +11 → ?

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Answer: 13

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":2}
  • {"op":"-","operand":23}
  • {"op":"-","operand":1}
  • {"op":"+","operand":2}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 8 → -6 → x5 → +5 → +4 → +4 → ?

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Answer: 23

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":6}
  • {"op":"x","operand":5}
  • {"op":"+","operand":5}
  • {"op":"+","operand":4}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 2 → x5 → -7 → +9 → +7 → +6 → ?

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Answer: 25

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":7}
  • {"op":"+","operand":9}
  • {"op":"+","operand":7}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 1 → x4 → -2 → -1 → +11 → x5 → ?

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Answer: 60

SubType
number-chain
Start
1
Steps
  • {"op":"x","operand":4}
  • {"op":"-","operand":2}
  • {"op":"-","operand":1}
  • {"op":"+","operand":11}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 2 → +12 → x4 → +6 → +5 → -20 → ?

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Answer: 47

SubType
number-chain
Start
2
Steps
  • {"op":"+","operand":12}
  • {"op":"x","operand":4}
  • {"op":"+","operand":6}
  • {"op":"+","operand":5}
  • {"op":"-","operand":20}
Difficulty
hard

Number Chain: 11 → +1 → x4 → +12 → -33 → +9 → ?

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Answer: 36

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":1}
  • {"op":"x","operand":4}
  • {"op":"+","operand":12}
  • {"op":"-","operand":33}
  • {"op":"+","operand":9}
Difficulty
hard