hard Set 77 Form Exercise

Number Chain: 4 → -1 → +5 → +10 → -11 → -5 → ?

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Answer: 2

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":5}
  • {"op":"+","operand":10}
  • {"op":"-","operand":11}
  • {"op":"-","operand":5}
Difficulty
hard

Number Chain: 11 → +4 → x3 → x4 → x2 → -51 → ?

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Answer: 309

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":4}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"-","operand":51}
Difficulty
hard

Number Chain: 8 → -2 → x3 → +7 → -16 → -5 → ?

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Answer: 4

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":7}
  • {"op":"-","operand":16}
  • {"op":"-","operand":5}
Difficulty
hard

Number Chain: 8 → x2 → -11 → -3 → x2 → +6 → ?

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Answer: 10

SubType
number-chain
Start
8
Steps
  • {"op":"x","operand":2}
  • {"op":"-","operand":11}
  • {"op":"-","operand":3}
  • {"op":"x","operand":2}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 4 → +5 → +5 → x5 → +4 → -39 → ?

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Answer: 35

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":5}
  • {"op":"+","operand":5}
  • {"op":"x","operand":5}
  • {"op":"+","operand":4}
  • {"op":"-","operand":39}
Difficulty
hard

Number Chain: 2 → x2 → +1 → x4 → +9 → x5 → ?

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Answer: 145

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":1}
  • {"op":"x","operand":4}
  • {"op":"+","operand":9}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 9 → -1 → +10 → x4 → -1 → x2 → ?

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Answer: 142

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":10}
  • {"op":"x","operand":4}
  • {"op":"-","operand":1}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 1 → +11 → x3 → +8 → -38 → x2 → ?

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Answer: 12

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":11}
  • {"op":"x","operand":3}
  • {"op":"+","operand":8}
  • {"op":"-","operand":38}
  • {"op":"x","operand":2}
Difficulty
hard