What is the sum of -2.5 and 4.0?

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Multiple Choice

What is the sum of -2.5 and 4.0?

Explanation:
When adding a negative number and a positive number, think in terms of how much you’re moving on the number line and which direction dominates. The positive is larger in magnitude, 4.0 versus 2.5, so you effectively subtract 2.5 from 4.0 and keep the positive sign. That gives 4.0 − 2.5 = 1.5. So the sum is 1.5. On a number line, starting at −2.5 and moving 4 units to the right lands at 1.5, which matches the subtraction view.

When adding a negative number and a positive number, think in terms of how much you’re moving on the number line and which direction dominates. The positive is larger in magnitude, 4.0 versus 2.5, so you effectively subtract 2.5 from 4.0 and keep the positive sign. That gives 4.0 − 2.5 = 1.5. So the sum is 1.5.

On a number line, starting at −2.5 and moving 4 units to the right lands at 1.5, which matches the subtraction view.

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