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Explanation: trading es cuando en el aprendizaje de las matemáticas se tiene que aprender a agrupar en unidades, decenas y centenas... tanto a "componer" como "descomponer" cifras 2 hundreds + 36 ones: 236
Trading (or grouping) – grouping numbers into groups of 1s, 10s, 100s, 1000s (etc) in order to perform simple additions and subtractions For example, you get 10 of a particular unit and then trade it for one of the subsequent unit (i.e 10 ones are traded for 1 ten. 10 tens are traded for 1 hundred). It is important for teachers to make sure the students understand the link between the blocks, the actions and the words – than merely move the blocks as directed by the teacher without making the connections with the concept of trading and the addition process.