hard Set 25 Form Exercise

Number Chain: 6 → -1 → x3 → x5 → -67 → -3 → ?

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Answer: 5

SubType
number-chain
Start
6
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"x","operand":5}
  • {"op":"-","operand":67}
  • {"op":"-","operand":3}
Difficulty
hard

Number Chain: 10 → -8 → -1 → x3 → x4 → -5 → ?

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Answer: 7

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":8}
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"-","operand":5}
Difficulty
hard

Number Chain: 7 → +4 → x3 → -27 → -3 → x2 → ?

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Answer: 6

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":4}
  • {"op":"x","operand":3}
  • {"op":"-","operand":27}
  • {"op":"-","operand":3}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 11 → x4 → x5 → x5 → +6 → -491 → ?

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Answer: 615

SubType
number-chain
Start
11
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":5}
  • {"op":"x","operand":5}
  • {"op":"+","operand":6}
  • {"op":"-","operand":491}
Difficulty
hard

Number Chain: 12 → -6 → x3 → x3 → x2 → x4 → ?

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Answer: 432

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":6}
  • {"op":"x","operand":3}
  • {"op":"x","operand":3}
  • {"op":"x","operand":2}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 10 → -2 → +12 → x4 → -20 → x5 → ?

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Answer: 300

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":2}
  • {"op":"+","operand":12}
  • {"op":"x","operand":4}
  • {"op":"-","operand":20}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 12 → -2 → x3 → +7 → x2 → +8 → ?

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Answer: 82

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":7}
  • {"op":"x","operand":2}
  • {"op":"+","operand":8}
Difficulty
hard

Number Chain: 10 → -5 → x3 → +2 → +6 → +8 → ?

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Answer: 31

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":5}
  • {"op":"x","operand":3}
  • {"op":"+","operand":2}
  • {"op":"+","operand":6}
  • {"op":"+","operand":8}
Difficulty
hard