hard Set 75 Form Exercise

Number Chain: 5 → -4 → -1 → -1 → -1 → +1 → ?

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Answer: -1

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

Number Chain: 8 → +10 → -1 → -16 → +2 → +8 → ?

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Answer: 11

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":10}
  • {"op":"-","operand":1}
  • {"op":"-","operand":16}
  • {"op":"+","operand":2}
  • {"op":"+","operand":8}
Difficulty
hard

Number Chain: 9 → +12 → x5 → -53 → +8 → x5 → ?

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Answer: 300

SubType
number-chain
Start
9
Steps
  • {"op":"+","operand":12}
  • {"op":"x","operand":5}
  • {"op":"-","operand":53}
  • {"op":"+","operand":8}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 10 → +7 → +10 → +11 → +7 → x4 → ?

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Answer: 180

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":7}
  • {"op":"+","operand":10}
  • {"op":"+","operand":11}
  • {"op":"+","operand":7}
  • {"op":"x","operand":4}
Difficulty
hard

Number Chain: 9 → -4 → x5 → +1 → +6 → +11 → ?

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Answer: 43

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":4}
  • {"op":"x","operand":5}
  • {"op":"+","operand":1}
  • {"op":"+","operand":6}
  • {"op":"+","operand":11}
Difficulty
hard

Number Chain: 6 → x5 → +2 → x5 → x4 → +5 → ?

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Answer: 645

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

Number Chain: 10 → -2 → x5 → +10 → x5 → x5 → ?

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Answer: 1250

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":2}
  • {"op":"x","operand":5}
  • {"op":"+","operand":10}
  • {"op":"x","operand":5}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 10 → +6 → +6 → x3 → -63 → x4 → ?

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Answer: 12

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":6}
  • {"op":"+","operand":6}
  • {"op":"x","operand":3}
  • {"op":"-","operand":63}
  • {"op":"x","operand":4}
Difficulty
hard