Summary: Addition Subtraction
When Gauss said that mathematics was the queen of sciences and arithmetic the queen of mathematics, he was not lying. Without arithmetic, there could be no mathematics; for the essence of this most challenging discipline lies in the ability to manipulate numbers and figures. Multiplication, division, addition, and subtraction form the core of arithmetic operations. [...]
As students, we become comfortable with what we learn first. Of the
four arithmetic operations of addition, subtraction,
multiplication, and division, we learn to add first and for this
reason are most comfortable with addition. If we apply the
principle of thinking in terms of what we are most comfortable
with, then subtraction need not [...]
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