Multiplication

Multiplication is repeated addition. There are many signs of multiplication, and the famous is "$\times$" (read as times). Other signs are "$.$" (dot), "$()$" (opening and closing parentheses), and "$*$" (asterisk). For example, $4 \times 6$ can be written as $4 \cdot 6$, or $4(6)$, or $4*6$. Multiplication is the inverse (or "opposite") of division. It is recommended that we memorize the multiplication table. For example, $4 \times 6$ means that $4+4+4+4+4+4=24$ or $6+6+6+6=24$.

If I eat $5$ apples a day regularly, what is the total number of apples I eat in a week?

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In $1$ week there are $7$ days, so the total number of apples I eat in a week is $5 \times 7=35,$ or $5+5+5+5+5+5+5=35,$ or $7+7+7+7+7=35.$ $_\square$