easy Set 90 Form Exercise

Number Chain: 8 → -5 → +4 → +2 → ?

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Answer: 9

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

Number Chain: 8 → -3 → -1 → -2 → ?

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Answer: 2

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":3}
  • {"op":"-","operand":1}
  • {"op":"-","operand":2}
Difficulty
easy

Number Chain: 10 → +8 → +10 → -21 → ?

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Answer: 7

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":8}
  • {"op":"+","operand":10}
  • {"op":"-","operand":21}
Difficulty
easy

Number Chain: 3 → -2 → +3 → +8 → ?

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Answer: 12

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

Number Chain: 4 → -2 → +1 → -2 → ?

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Answer: 1

SubType
number-chain
Start
4
Steps
  • {"op":"-","operand":2}
  • {"op":"+","operand":1}
  • {"op":"-","operand":2}
Difficulty
easy

Number Chain: 8 → -7 → -1 → -1 → ?

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Answer: -1

SubType
number-chain
Start
8
Steps
  • {"op":"-","operand":7}
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
Difficulty
easy

Number Chain: 10 → -2 → -3 → -4 → ?

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Answer: 1

SubType
number-chain
Start
10
Steps
  • {"op":"-","operand":2}
  • {"op":"-","operand":3}
  • {"op":"-","operand":4}
Difficulty
easy

Number Chain: 2 → -1 → -1 → +3 → ?

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Answer: 3

SubType
number-chain
Start
2
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"+","operand":3}
Difficulty
easy