ultimath:

The model method is a very powerful problem-solving strategy extensively used in the Primary Mathematics curriculum in Singapore, sometimes referred to as “Singapore Math” by other countries. Model Method help students visualize and simplify a math problem in a pictorial way. It was developed and popularized by Mr Hector Chee, a Singapore teacher, in 1990s.
Versatile and used in various topics
It is used to teach a wide range of Mathematics topics taught in the Primary Mathematics curriculum in Primary schools (elementary schools). Some of these include arithmetic, fractions, percentage, decimals, average, ratio and of course various problem sums testing these topics. It provides the pictorial perspective of the Mathematical problems and also provides easy analysis of ‘parts whole’ and comparison between quantities