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Units of value: ruble, kopeck

We use money to buy things. In many countries a common unit is the dollar ($). One dollar equals 100 cents (¢). Coins might be 1¢, 5¢, 10¢, 25¢, and $1 or $2 pieces. Paper bills are often $1, $5, $10, $20, $50, and $100 (names vary by country). You can add dollars like whole numbers, and handle cents separately when needed.
1 dollar=100 cents1\ \text{dollar} = 100\ \text{cents}
Coins: pennies, nickels, dimes, quarters, and dollar coins
Bills: $1, $5, $10, $20, and higher
Add dollars like ordinary numbers; track cents on the side
Turn dollars into cents
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