1. **State the problem:** We need to find the sum of 1 and 5.
2. **Formula used:** Addition of two numbers is given by $a + b$.
3. **Apply the formula:** Here, $a = 1$ and $b = 5$, so we calculate:
$$1 + 5$$
4. **Perform the addition:** Adding 1 and 5 gives:
$$6$$
5. **Final answer:** The sum of 1 and 5 is 6.
Simple Addition D93503
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