hard Set 21 Form Exercise

Number Chain: 7 → -3 → x2 → -4 → x4 → +5 → ?

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Answer: 21

SubType
number-chain
Start
7
Steps
  • {"op":"-","operand":3}
  • {"op":"x","operand":2}
  • {"op":"-","operand":4}
  • {"op":"x","operand":4}
  • {"op":"+","operand":5}
Difficulty
hard

Number Chain: 12 → +6 → +9 → +4 → +12 → x4 → ?

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Answer: 172

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":6}
  • {"op":"+","operand":9}
  • {"op":"+","operand":4}
  • {"op":"+","operand":12}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 7 → +7 → +8 → x3 → +10 → x3 → ?

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Answer: 228

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":7}
  • {"op":"+","operand":8}
  • {"op":"x","operand":3}
  • {"op":"+","operand":10}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 12 → x5 → x3 → +6 → x5 → +8 → ?

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Answer: 938

SubType
number-chain
Start
12
Steps
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"+","operand":6}
  • {"op":"x","operand":5}
  • {"op":"+","operand":8}
Difficulty
hard

Number Chain: 8 → +8 → +8 → +6 → x3 → +10 → ?

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Answer: 100

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

Number Chain: 7 → x4 → +5 → x5 → -109 → x2 → ?

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Answer: 112

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":5}
  • {"op":"x","operand":5}
  • {"op":"-","operand":109}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 4 → x4 → x3 → -17 → +7 → -15 → ?

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Answer: 23

SubType
number-chain
Start
4
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
  • {"op":"-","operand":17}
  • {"op":"+","operand":7}
  • {"op":"-","operand":15}
Difficulty
hard

Number Chain: 2 → -1 → +7 → -4 → +1 → -4 → ?

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Answer: 1

SubType
number-chain
Start
2
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":7}
  • {"op":"-","operand":4}
  • {"op":"+","operand":1}
  • {"op":"-","operand":4}
Difficulty
hard