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To solve this problem, we will perform the following steps:
Let's perform the addition:
Starting from the right, we add the digits in the tenths place: .
Next, add the digits in the units place: .
Finally, add the digit in the tens place: .
Therefore, the result of adding is:
We can verify that this matches with the given answer choices. The correct choice is:
Option 1:
12.4
\( \text{0.6+0}.5= \)
Decimal points show place value! The 1 in 10.1 means 1 tenth, not 1 whole. Ignoring decimals would give you 124 instead of 12.4 - that's off by more than 100!
Add trailing zeros to make them the same length! For example, treat 10.1 as 10.10 when adding to 2.30. This makes column addition much clearer.
The decimal point in your answer goes in the same column as the decimal points in the numbers you're adding. It lines up vertically!
You can, but it's easier to go right to left in case you need to carry. This matches how we add whole numbers and prevents confusion.
Label the columns! Write tens | ones | . | tenths above your work. This helps you keep track of place values as you add.
Use estimation! Round and , so the answer should be close to 12. Since 12.4 is close to 12, it makes sense!
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