hard Set 37 Form Exercise

Number Chain: 9 → -7 → x4 → -7 → -1 → +12 → ?

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Answer: 12

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":7}
  • {"op":"x","operand":4}
  • {"op":"-","operand":7}
  • {"op":"-","operand":1}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 6 → +12 → +12 → -3 → -9 → +1 → ?

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Answer: 19

SubType
number-chain
Start
6
Steps
  • {"op":"+","operand":12}
  • {"op":"+","operand":12}
  • {"op":"-","operand":3}
  • {"op":"-","operand":9}
  • {"op":"+","operand":1}
Difficulty
hard

Number Chain: 10 → -5 → x3 → -4 → -8 → x3 → ?

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Answer: 9

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

Number Chain: 6 → x3 → -15 → +1 → -3 → +12 → ?

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Answer: 13

SubType
number-chain
Start
6
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":15}
  • {"op":"+","operand":1}
  • {"op":"-","operand":3}
  • {"op":"+","operand":12}
Difficulty
hard

Number Chain: 10 → x3 → -28 → -1 → -1 → -1 → ?

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Answer: -1

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":28}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 4 → -3 → -1 → x3 → -1 → +11 → ?

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Answer: 10

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":3}
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"-","operand":1}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 2 → x4 → x2 → +6 → x3 → -18 → ?

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Answer: 48

SubType
number-chain
Start
2
Steps
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
  • {"op":"+","operand":6}
  • {"op":"x","operand":3}
  • {"op":"-","operand":18}
Difficulty
hard

Number Chain: 10 → x2 → +6 → -16 → +11 → -11 → ?

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Answer: 10

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":6}
  • {"op":"-","operand":16}
  • {"op":"+","operand":11}
  • {"op":"-","operand":11}
Difficulty
hard