Usa la sustracción de números enteros para encontrar la diferencia en cada una de las situaciones a continuación:
Bob tenía 10 barras de chocolate y se comió 3.
Jaime ganó $200 ayer y $180 hoy. ¿Cuánto dinero extra ganó ayer en comparación con hoy?
Tomás le pidió prestado $80 a Juan la semana pasada. Esta semana Tomás le pagó a Juan $50- ¿Cuánto dinero le debe todavía Tomás a Juan?
Encuentra los valores faltantes:
(+8) – (__) = +5
(__) – (+6) = – 2
(– 5) – (__) = – 1
(__) – (– 8) = +6
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En esta sección introduciremos este concepto básico de quitar cantidades de un mismo tipo de objeto a un grupo, osea, hablaremos de la sustracción matemática o resta: y veremos su estrecha relación con otra operación matemática básica, la suma.
Tomando como objetos base círculos rojos o azules, los cuales representarán los números enteros de "más uno" y "menos uno", aprenderemos a escribir expresiones de suma y/o resta.