1. Let's start with a simple problem: Add 3.75 and 2.4. 2. To add decimals, align the decimal points and add as with whole numbers. 3. Write the numbers as: $$\begin{array}{r} 3.75 \\ +2.40 \\ \hline \end{array}$$ 4. Add the digits from right to left: $$5 + 0 = 5$$ $$7 + 4 = 11$$ (write 1 and carry 1) $$3 + 2 + 1 = 6$$ 5. So, the sum is: $$6.15$$ 6. Therefore, $3.75 + 2.4 = 6.15$. This is how you add decimals by aligning decimal points and adding digit by digit.