![]() ![]() Look at the column titled Value (dollars). This will keep the numbers aligned ones to ones, tenths to tenths, hundredths to hundredths, and so on. In order to keep the numbers in the proper place-value column when adding decimals, align the decimal points. When you add whole numbers, as shown in the Value (cents) column above, you line up the numbers so that the digits in the ones place-value column are aligned. As you review the table, pay attention to the place values. The table below shows a step-by-step approach to adding the coins in terms of cents and also as dollars. You can also write this amount in terms of the number of dollars she has: $0.87. But they can also be represented as decimal numbers, too, because quarters, dimes, nickels, and pennies are each worth less than one whole dollar. The coins you use every day can all be represented as whole cent values, as shown above. This problem provides a good starting point for our conversation because you can use your knowledge about pocket change to understand the basics about how to add decimals. ![]() So, Celia does have enough money to ride the bus.” Adding a dime brings me to 85¢, and then another two pennies is 87¢. Does she have enough money? Some people may solve it like this: “I know each quarter is 25¢, so three quarters is 75¢. ![]() Take a moment to think about this problem. Does she have enough money to ride the bus? She reaches into her purse and pulls out the following coins: 3 quarters, 1 dime and 2 pennies. Suppose Celia needs $0.80 to ride the bus from home to her office. ![]()
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