First lessons of Arithmetic: Lesson IV. simple addition 7 and 8

Numbers 7 and 8

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WIKI: A number is a mathematical object used in counting and measuring. A notational symbol which represents a number is called a numeral, but in common usage the word number is used for both the abstract object and the symbol, as well as for the word for the number. In addition to their use in counting and measuring, numerals are often used for labels (telephone numbers), for ordering (serial numbers), and for codes (ISBNs). In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational numbers, irrational numbers, and complex numbers.

Lessons in this series:

• Introduction and Lesson I
• Lesson II.
• Lesson III.
• Lesson V
• Lesson VI
• Lesson VII.
• Lesson VIII.
• Lesson IX.
• Lesson X.
• Lesson XI.
• Lesson XII
• Lesson XIII.
• Lesson XIV.
• Lesson XV.