hard Set 63 Form Exercise

Number Chain: 12 → -10 → +9 → -10 → +4 → +11 → ?

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Answer: 16

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":10}
  • {"op":"+","operand":9}
  • {"op":"-","operand":10}
  • {"op":"+","operand":4}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 12 → -9 → x5 → x3 → +8 → -50 → ?

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Answer: 3

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":9}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"+","operand":8}
  • {"op":"-","operand":50}
Difficulty
hard

Number Chain: 12 → -11 → x5 → +9 → +1 → -1 → ?

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Answer: 14

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":11}
  • {"op":"x","operand":5}
  • {"op":"+","operand":9}
  • {"op":"+","operand":1}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 12 → +4 → +6 → x5 → x4 → x5 → ?

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Answer: 2200

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

Number Chain: 9 → -2 → x3 → x3 → -57 → +12 → ?

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Answer: 18

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
  • {"op":"x","operand":3}
  • {"op":"-","operand":57}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 6 → x3 → x5 → x2 → -175 → x4 → ?

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Answer: 20

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":3}
  • {"op":"x","operand":5}
  • {"op":"x","operand":2}
  • {"op":"-","operand":175}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 1 → -1 → -1 → -1 → -1 → x4 → ?

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Answer: -12

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

Number Chain: 4 → +10 → -3 → +3 → x4 → x3 → ?

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Answer: 168

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