hard Set 61 Form Exercise

Number Chain: 5 → +5 → +1 → -2 → x2 → -15 → ?

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Answer: 3

SubType
number-chain
Start
5
Steps
  • {"op":"+","operand":5}
  • {"op":"+","operand":1}
  • {"op":"-","operand":2}
  • {"op":"x","operand":2}
  • {"op":"-","operand":15}
Difficulty
hard

Number Chain: 7 → +3 → +9 → +10 → -23 → -2 → ?

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Answer: 4

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":3}
  • {"op":"+","operand":9}
  • {"op":"+","operand":10}
  • {"op":"-","operand":23}
  • {"op":"-","operand":2}
Difficulty
hard

Number Chain: 1 → x2 → -1 → -1 → -1 → -1 → ?

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Answer: -2

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

Number Chain: 9 → -8 → -1 → x2 → x3 → +9 → ?

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Answer: 9

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":8}
  • {"op":"-","operand":1}
  • {"op":"x","operand":2}
  • {"op":"x","operand":3}
  • {"op":"+","operand":9}
Difficulty
hard

Number Chain: 8 → x3 → +2 → -19 → x2 → -8 → ?

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Answer: 6

SubType
number-chain
Start
8
Steps
  • {"op":"x","operand":3}
  • {"op":"+","operand":2}
  • {"op":"-","operand":19}
  • {"op":"x","operand":2}
  • {"op":"-","operand":8}
Difficulty
hard

Number Chain: 5 → x3 → +8 → +2 → +9 → -20 → ?

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Answer: 14

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":3}
  • {"op":"+","operand":8}
  • {"op":"+","operand":2}
  • {"op":"+","operand":9}
  • {"op":"-","operand":20}
Difficulty
hard

Number Chain: 8 → +6 → +1 → +2 → -3 → -4 → ?

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Answer: 10

SubType
number-chain
Start
8
Steps
  • {"op":"+","operand":6}
  • {"op":"+","operand":1}
  • {"op":"+","operand":2}
  • {"op":"-","operand":3}
  • {"op":"-","operand":4}
Difficulty
hard

Number Chain: 5 → x4 → +8 → -6 → -4 → -6 → ?

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Answer: 12

SubType
number-chain
Start
5
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":8}
  • {"op":"-","operand":6}
  • {"op":"-","operand":4}
  • {"op":"-","operand":6}
Difficulty
hard