1. **State the problem:** Calculate the sum of $6 \times 10^{1}$ and $9 \times 10^{1}$.\n\n2. **Evaluate each term:**\n\n- $6 \times 10^{1} = 6 \times 10 = 60$.\n\n- $9 \times 10^{1} = 9 \times 10 = 90$.\n\n3. **Add the results:**\n\n$$ 60 + 90 = 150 $$\n\n**Final answer:** $150$