1. **State the problem:** Calculate the sum of 70 and 80.
2. **Formula used:** Addition of two numbers is given by $a + b$.
3. **Apply the formula:** Here, $a = 70$ and $b = 80$.
4. **Calculate:**
$$70 + 80 = 150$$
5. **Conclusion:** The sum of 70 and 80 is 150.
Simple Addition Af3E4C
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