arithmetic
noun B1- The mathematics of numbers (integers, rational numbers, real numbers, or complex numbers) under the operations of addition, subtraction, multiplication, and division.
- Number theory.
Plural arithmetics
From the library
Gilbert Blythe spelled her down in class and left her clear out of sight in mental arithmetic.
When school went out Anne marched to her desk, ostentatiously took out everything therein, books and writing tablet, pen and ink, testament and arithmetic, and piled them neatly on her cracked slate.
But flesh and blood don’t come under the head of arithmetic and that’s where Marilla Cuthbert makes her mistake.
Mine is geometry of course, and Jane’s is Latin, and Ruby and Charlie’s is algebra, and Josie’s is arithmetic.
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