hard Set 72 Form Exercise

Number Chain: 6 → +6 → -7 → +8 → -10 → +7 → ?

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Answer: 10

SubType
number-chain
Start
6
Steps
  • {"op":"+","operand":6}
  • {"op":"-","operand":7}
  • {"op":"+","operand":8}
  • {"op":"-","operand":10}
  • {"op":"+","operand":7}
Difficulty
hard

Number Chain: 4 → x5 → -5 → -11 → -2 → x3 → ?

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Answer: 6

SubType
number-chain
Start
4
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":5}
  • {"op":"-","operand":11}
  • {"op":"-","operand":2}
  • {"op":"x","operand":3}
Difficulty
hard

Number Chain: 5 → x2 → x2 → -8 → -8 → -3 → ?

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Answer: 1

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

Number Chain: 12 → -11 → -1 → x2 → x2 → -1 → ?

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Answer: -1

SubType
number-chain
Start
12
Steps
  • {"op":"-","operand":11}
  • {"op":"-","operand":1}
  • {"op":"x","operand":2}
  • {"op":"x","operand":2}
  • {"op":"-","operand":1}
Difficulty
hard

Number Chain: 12 → +8 → -1 → +8 → x4 → -63 → ?

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Answer: 45

SubType
number-chain
Start
12
Steps
  • {"op":"+","operand":8}
  • {"op":"-","operand":1}
  • {"op":"+","operand":8}
  • {"op":"x","operand":4}
  • {"op":"-","operand":63}
Difficulty
hard

Number Chain: 10 → x5 → +3 → -38 → -11 → x5 → ?

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Answer: 20

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":5}
  • {"op":"+","operand":3}
  • {"op":"-","operand":38}
  • {"op":"-","operand":11}
  • {"op":"x","operand":5}
Difficulty
hard

Number Chain: 5 → -4 → +8 → +10 → +7 → -6 → ?

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Answer: 20

SubType
number-chain
Start
5
Steps
  • {"op":"-","operand":4}
  • {"op":"+","operand":8}
  • {"op":"+","operand":10}
  • {"op":"+","operand":7}
  • {"op":"-","operand":6}
Difficulty
hard

Number Chain: 9 → x3 → -17 → +12 → +10 → -27 → ?

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Answer: 5

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":3}
  • {"op":"-","operand":17}
  • {"op":"+","operand":12}
  • {"op":"+","operand":10}
  • {"op":"-","operand":27}
Difficulty
hard