(1) 加法 Add

这类题目中，提示一般表示数字的和。In this type puzzles, the clue always means the sum of numbers.

✿加法Add

✿箭头Arrow

      ∎无头箭Fuzzy Arrow

            ∎领奖台Podium

            ∎区域等和线Region Sum Lines

            ∎拉链线Zipper Lines

✿杀手Killer

      ∎代码杀手Code Killer

      ∎尾数5杀手Number 5 still alive

      ∎可重复杀手Repeated Killer

      ∎待定杀手Unsure Killer

✿柠檬Lemon

✿和排序Unique Order Sum

(2) 减法 Minus

这类题目中，提示一般表示数字的差。In this type puzzles, the clue always means the difference of numbers.

✿排差Anti-Difference

✿等差数列Arithmetic

✿德国耳语German Whisper

✿最大最小差Max Min Difference

(3) 乘法 Multiple

这类题目中，提示一般表示数字的积。In this type puzzles, the clue always means the product of numbers.

✿算式Calculation

      ∎双层巴士Bus

✿乘积Product

      ∎邻积Neighbor Product

      ∎乘法箭头Product Arrows

               ∎九九乘法箭Kuku

      ∎积十位Tens Product

(4) 除法 Divide

这类题目中，提示一般表示数字的商/比值/因数。In this type puzzles, the clue always means the quotients/ratio/factors of numbers.

✿因数Factor

✿倍数Multiple

✿比例Ratio

      ∎扩展比例Extend Ratio

(5) 数字性质 Number type

✿十一倍Eleven

✿质数Prime

✿平方数Square

(6) 混合 Mix

✿钻石Diamond

✿行列式Determination

✿杠杆Lever

✿幻方Magic Suqare

✿四则运算Mathdoku