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To solve this problem, we will add the decimal numbers 20.2 and 8.8. Here is how we proceed:
Step 1: Align the decimal numbers:
Step 2: Add column by column, starting from the right.
First, add the tenths: . Since 10 is more than 9, write 0 and carry over 1 to the units column.
Then, add the units: , plus the carry-over 1 makes it 9.
Finally, add the tens: .
When combining the results, we get:
.
Therefore, the sum of and is \( \textbf{} \).
29
Choose the correct writing form:
When adding decimals, you might think you need extra decimal places, but that's not always true! In this problem, , which equals 29 exactly.
Both 29.0 and 29 are mathematically correct! However, 29 is the simplest form since the decimal part is zero.
When any column adds up to 10 or more, write down the ones digit and carry the tens digit to the next column left. So 2 + 8 = 10 becomes: write 0, carry 1.
The decimal point in your answer goes in the same position as the decimal points in the numbers you're adding. Since both numbers have one decimal place, align everything vertically.
No! Always line up the decimal points first. Adding 20.2 + 8.8 without alignment leads to mistakes. Proper alignment ensures you're adding tenths to tenths, units to units, etc.
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