hard Set 99 Form Exercise

Number Chain: 5 → -1 → x2 → x3 → -6 → x4 → ?

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Answer: 72

SubType
number-chain
Start
5
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":2}
  • {"op":"x","operand":3}
  • {"op":"-","operand":6}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 1 → +10 → x4 → x4 → -40 → x5 → ?

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Answer: 680

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":10}
  • {"op":"x","operand":4}
  • {"op":"x","operand":4}
  • {"op":"-","operand":40}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 1 → +7 → -6 → +8 → +11 → x3 → ?

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Answer: 63

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":7}
  • {"op":"-","operand":6}
  • {"op":"+","operand":8}
  • {"op":"+","operand":11}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 4 → +9 → x2 → x2 → +8 → +12 → ?

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Answer: 72

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":9}
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
  • {"op":"+","operand":8}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 2 → x5 → +1 → -2 → x3 → -11 → ?

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Answer: 16

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":1}
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"-","operand":11}
Difficulty
hard

Number Chain: 1 → +7 → -6 → -1 → x4 → +3 → ?

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Answer: 7

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":7}
  • {"op":"-","operand":6}
  • {"op":"-","operand":1}
  • {"op":"x","operand":4}
  • {"op":"+","operand":3}
Difficulty
hard

Number Chain: 8 → -2 → -5 → +2 → +12 → +4 → ?

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Answer: 19

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":2}
  • {"op":"-","operand":5}
  • {"op":"+","operand":2}
  • {"op":"+","operand":12}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 4 → x4 → -3 → -4 → x4 → +7 → ?

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Answer: 43

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