-2.8 + 45.3 =
Understand the Problem
The question is asking to perform the addition of -2.8 and 45.3. This involves combining a negative and a positive number and determining the resulting sum.
Answer
The sum is $42.5$.
Answer for screen readers
The final answer is $42.5$.
Steps to Solve
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Identify the numbers to add We have two numbers: -2.8 (a negative number) and 45.3 (a positive number).
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Calculate the absolute value of the negative number Find the absolute value of -2.8, which is 2.8.
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Perform the subtraction Subtract the absolute value of the negative number from the positive number: $$ 45.3 - 2.8 $$
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Calculate the result Perform the calculation: $$ 45.3 - 2.8 = 42.5 $$
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Determine the sign of the result Since the positive number (45.3) is larger than the negative number (-2.8), the result is positive: $$ -2.8 + 45.3 = 42.5 $$
The final answer is $42.5$.
More Information
When adding a negative number to a positive number, you're essentially subtracting the absolute value of the negative number from the positive number. In this case, you combined -2.8 and 45.3 to reach 42.5.
Tips
- Ignoring the sign: Sometimes, students forget that subtracting a negative number means combining values correctly. Always check the signs.
- Incorrectly performing subtraction: Ensure you subtract the smaller absolute value from the larger absolute value.
