hard Set 21 Form Exercise

Number Chain: 8 → +4 → -9 → x2 → +2 → -4 → ?

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Answer: 4

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

Number Chain: 2 → +2 → -3 → +12 → x3 → x3 → ?

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Answer: 117

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

Number Chain: 10 → +3 → +4 → x2 → x2 → x2 → ?

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Answer: 136

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":3}
  • {"op":"+","operand":4}
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 12 → +6 → -17 → +10 → x4 → x2 → ?

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Answer: 88

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":6}
  • {"op":"-","operand":17}
  • {"op":"+","operand":10}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 6 → -1 → +5 → x5 → +7 → x4 → ?

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Answer: 228

SubType
number-chain
Start
6
Steps
  • {"op":"-","operand":1}
  • {"op":"+","operand":5}
  • {"op":"x","operand":5}
  • {"op":"+","operand":7}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 8 → +8 → +1 → -16 → x4 → +6 → ?

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Answer: 10

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":8}
  • {"op":"+","operand":1}
  • {"op":"-","operand":16}
  • {"op":"x","operand":4}
  • {"op":"+","operand":6}
Difficulty
hard

Number Chain: 5 → x4 → +4 → +11 → x4 → +11 → ?

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Answer: 151

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

Number Chain: 1 → +8 → x4 → -31 → +7 → -2 → ?

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Answer: 10

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":8}
  • {"op":"x","operand":4}
  • {"op":"-","operand":31}
  • {"op":"+","operand":7}
  • {"op":"-","operand":2}
Difficulty
hard