hard Set 65 Form Exercise

Number Chain: 2 → -1 → x5 → -1 → x3 → +4 → ?

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Answer: 16

SubType
number-chain
Start
2
Steps
  • {"op":"-","operand":1}
  • {"op":"x","operand":5}
  • {"op":"-","operand":1}
  • {"op":"x","operand":3}
  • {"op":"+","operand":4}
Difficulty
hard

Number Chain: 12 → +4 → +10 → +8 → -29 → -3 → ?

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Answer: 2

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":4}
  • {"op":"+","operand":10}
  • {"op":"+","operand":8}
  • {"op":"-","operand":29}
  • {"op":"-","operand":3}
Difficulty
hard

Number Chain: 9 → x2 → +8 → -4 → -16 → x5 → ?

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Answer: 30

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":8}
  • {"op":"-","operand":4}
  • {"op":"-","operand":16}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 1 → +12 → +3 → x3 → x5 → -15 → ?

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Answer: 225

SubType
number-chain
Start
1
Steps
  • {"op":"+","operand":12}
  • {"op":"+","operand":3}
  • {"op":"x","operand":3}
  • {"op":"x","operand":5}
  • {"op":"-","operand":15}
Difficulty
hard

Number Chain: 8 → +11 → x3 → +2 → -52 → x2 → ?

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Answer: 14

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":11}
  • {"op":"x","operand":3}
  • {"op":"+","operand":2}
  • {"op":"-","operand":52}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 4 → x2 → x3 → +4 → +10 → -30 → ?

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Answer: 8

SubType
number-chain
Start
4
Steps
  • {"op":"x","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":4}
  • {"op":"+","operand":10}
  • {"op":"-","operand":30}
Difficulty
hard

Number Chain: 11 → x3 → +6 → -35 → -2 → x2 → ?

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Answer: 4

SubType
number-chain
Start
11
Steps
  • {"op":"x","operand":3}
  • {"op":"+","operand":6}
  • {"op":"-","operand":35}
  • {"op":"-","operand":2}
  • {"op":"x","operand":2}
Difficulty
hard

Number Chain: 11 → +8 → -17 → +3 → -2 → -2 → ?

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Answer: 1

SubType
number-chain
Start
11
Steps
  • {"op":"+","operand":8}
  • {"op":"-","operand":17}
  • {"op":"+","operand":3}
  • {"op":"-","operand":2}
  • {"op":"-","operand":2}
Difficulty
hard