Solve the following exercise and circle the appropriate answer:
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Solve the following exercise and circle the appropriate answer:
Let's solve the exercise in order:
We'll add up the thousandths after the decimal point:
We'll add up the hundredths after the decimal point:
We'll add up the tenths after the decimal point:
Finally, we'll subtract the whole numbers before the decimal point:
And we get:
7.825
Choose the correct writing form:
Decimal points show place value positions! When they're aligned, you add tenths to tenths, hundredths to hundredths, etc. Misaligned decimals mix up place values and give wrong answers.
Always start from the rightmost column (smallest place value) and work left! This matches how we add whole numbers and handles any carrying properly.
Add trailing zeros to make them equal length! For example, treat 3.5 as 3.500 when adding to 2.123. The zeros don't change the value.
The decimal point in your answer goes directly below the aligned decimal points in the problem. It stays in the same column position throughout.
Use estimation! Round each number: and , so . Your answer 7.825 is close to 8 ✓
Absolutely! Calculators are great for verification. But learning to add decimals by hand helps you understand place value and catch calculator errors.
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