Скачать с ютуб Addition and Subtraction: Definition, Notation, and Terminology в хорошем качестве

Addition and Subtraction: Definition, Notation, and Terminology

Course plan: https://docs.google.com/document/d/1V... PDF of notes: https://drive.google.com/file/d/1PeUt... We define addition and subtraction: 1. If we combine A units and B units, then we have A+B units all together. The unit amounts must be the same for all three expressions (for example 3 lbs+ 2lbs = 5 lbs, but 3 lbs + 2 oz does not equal 5 of anything). A and B are called terms, addends, or summands. A+B is called the sum or total. 2. If we have B units then we need A-B more units to have A units all together. The unit amounts must be the same for all three expressions. A is called the minuend, B is called the subtrahend, and A-B is called the difference.