medium Set 21 Form Exercise

Number Chain: 7 → +2 → -6 → -2 → +2 → ?

Show answer

Answer: 3

SubType
number-chain
Start
7
Steps
  • {"op":"+","operand":2}
  • {"op":"-","operand":6}
  • {"op":"-","operand":2}
  • {"op":"+","operand":2}
Difficulty
medium

Number Chain: 10 → x2 → +10 → -27 → x2 → ?

Show answer

Answer: 6

SubType
number-chain
Start
10
Steps
  • {"op":"x","operand":2}
  • {"op":"+","operand":10}
  • {"op":"-","operand":27}
  • {"op":"x","operand":2}
Difficulty
medium

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

Show answer

Answer: 18

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

Number Chain: 10 → +5 → x4 → -44 → -2 → ?

Show answer

Answer: 14

SubType
number-chain
Start
10
Steps
  • {"op":"+","operand":5}
  • {"op":"x","operand":4}
  • {"op":"-","operand":44}
  • {"op":"-","operand":2}
Difficulty
medium

Number Chain: 9 → -2 → +6 → x2 → +7 → ?

Show answer

Answer: 33

SubType
number-chain
Start
9
Steps
  • {"op":"-","operand":2}
  • {"op":"+","operand":6}
  • {"op":"x","operand":2}
  • {"op":"+","operand":7}
Difficulty
medium

Number Chain: 3 → -1 → -1 → +9 → -2 → ?

Show answer

Answer: 8

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

Number Chain: 4 → +4 → x4 → x3 → -58 → ?

Show answer

Answer: 38

SubType
number-chain
Start
4
Steps
  • {"op":"+","operand":4}
  • {"op":"x","operand":4}
  • {"op":"x","operand":3}
  • {"op":"-","operand":58}
Difficulty
medium

Number Chain: 5 → +7 → x5 → -10 → -22 → ?

Show answer

Answer: 28

SubType
number-chain
Start
5
Steps
  • {"op":"+","operand":7}
  • {"op":"x","operand":5}
  • {"op":"-","operand":10}
  • {"op":"-","operand":22}
Difficulty
medium