hard Set 61 Form Exercise

Number Chain: 1 → x3 → -1 → +5 → x2 → -8 → ?

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Answer: 6

SubType
number-chain
Start
1
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":1}
  • {"op":"+","operand":5}
  • {"op":"x","operand":2}
  • {"op":"-","operand":8}
Difficulty
hard

Number Chain: 8 → +11 → -8 → x4 → -40 → x4 → ?

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Answer: 16

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":11}
  • {"op":"-","operand":8}
  • {"op":"x","operand":4}
  • {"op":"-","operand":40}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 4 → -2 → x4 → x2 → -8 → -3 → ?

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Answer: 5

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"-","operand":8}
  • {"op":"-","operand":3}
Difficulty
hard

Number Chain: 10 → x5 → -14 → x5 → -68 → -72 → ?

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Answer: 40

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":14}
  • {"op":"x","operand":5}
  • {"op":"-","operand":68}
  • {"op":"-","operand":72}
Difficulty
hard

Number Chain: 6 → x4 → +11 → -28 → -2 → x5 → ?

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Answer: 25

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":11}
  • {"op":"-","operand":28}
  • {"op":"-","operand":2}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 12 → -6 → +10 → x4 → x4 → x5 → ?

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Answer: 1280

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":6}
  • {"op":"+","operand":10}
  • {"op":"x","operand":4}
  • {"op":"x","operand":4}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 5 → x3 → x3 → -17 → +2 → -27 → ?

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Answer: 3

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":3}
  • {"op":"-","operand":17}
  • {"op":"+","operand":2}
  • {"op":"-","operand":27}
Difficulty
hard

Number Chain: 3 → +4 → -3 → x2 → +5 → x2 → ?

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Answer: 26

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