medium Set 80 Form Exercise

Number Chain: 3 → +10 → +5 → x3 → +10 → ?

Show answer

Answer: 64

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

Number Chain: 7 → x2 → +2 → -15 → +4 → ?

Show answer

Answer: 5

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":2}
  • {"op":"-","operand":15}
  • {"op":"+","operand":4}
Difficulty
medium

Number Chain: 7 → x5 → x3 → x4 → x2 → ?

Show answer

Answer: 840

SubType
number-chain
Start
7
Steps
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
  • {"op":"x","operand":4}
  • {"op":"x","operand":2}
Difficulty
medium

Number Chain: 8 → x4 → +10 → x5 → x3 → ?

Show answer

Answer: 630

SubType
number-chain
Start
8
Steps
  • {"op":"x","operand":4}
  • {"op":"+","operand":10}
  • {"op":"x","operand":5}
  • {"op":"x","operand":3}
Difficulty
medium

Number Chain: 4 → +1 → x2 → x5 → -35 → ?

Show answer

Answer: 15

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":1}
  • {"op":"x","operand":2}
  • {"op":"x","operand":5}
  • {"op":"-","operand":35}
Difficulty
medium

Number Chain: 2 → +5 → x3 → x2 → x4 → ?

Show answer

Answer: 168

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

Number Chain: 1 → -1 → -1 → x4 → -1 → ?

Show answer

Answer: -5

SubType
number-chain
Start
1
Steps
  • {"op":"-","operand":1}
  • {"op":"-","operand":1}
  • {"op":"x","operand":4}
  • {"op":"-","operand":1}
Difficulty
medium

Number Chain: 9 → x5 → -15 → -15 → x4 → ?

Show answer

Answer: 60

SubType
number-chain
Start
9
Steps
  • {"op":"x","operand":5}
  • {"op":"-","operand":15}
  • {"op":"-","operand":15}
  • {"op":"x","operand":4}
Difficulty
medium