Add the decimals: align the decimal points.

• 8.29 + 4.75
• 9 + 5 = 14 hundredths: write 4, carry 1 to tenths
• 2 + 7 + 1(carry) = 10 tenths: write 0, carry 1 to ones
• 8 + 4 + 1(carry) = 13 ones
• 8.29 + 4.75 = 13.04

Final Answer: 13.04