Lesson 4: Adding and Subtracting Decimals — Practice Questions

1. 1. Calculate the sum: $8.14 + 3.59 = \_\_\_$.

2. 2. A ribbon is 15.85 meters long. If 11.25 meters are cut off, how many meters of ribbon are left?

   • A. 4.60
   • B. 4.50
   • C. 27.10
   • D. 4.06

3. 3. What is the total when you add $6.7$ and $2.48$? The sum is $\_\_\_$.

4. 4. What is the result of subtracting $5.62$ from $12.4$?

   • A. 6.78
   • B. 6.82
   • C. 7.22
   • D. 11.84

5. 5. When subtracting $3.14$ from $8.5$, what is the correct first step to align the numbers for subtraction?

   • A. Rewrite $8.5$ as $8.50$
   • B. Rewrite $3.14$ as $3.1$
   • C. Ignore the decimal points
   • D. Add the two numbers

6. 6. Write the number $58.13$ in expanded form. The expanded form is $5 \times 10 + 8 \times 1 +$ ___.

7. 7. A number is written in expanded form as $6 \times 1 + 4 \times 0.1 + 9 \times 0.001$. What is this number in standard decimal form?

   • A. 6.49
   • B. 6.409
   • C. 6.049
   • D. 649

8. 8. In the number $14.08$, the digit $8$ is in the hundredths place. What is the value represented by the digit $8$? ___

9. 9. Which expression correctly shows the number $7.35$ in expanded form using powers of ten?

   • A. $7 \times 10^1 + 3 \times 10^0 + 5 \times 10^{-1}$
   • B. $7 \times 10^0 + 3 \times 10^{-1} + 5 \times 10^{-2}$
   • C. $7 \times 10^0 + 3 \times 10^1 + 5 \times 10^2$
   • D. $7 \times 10^{-1} + 3 \times 10^{-2} + 5 \times 10^{-3}$

10. 10. How does the value of the digit 2 in $5.2$ compare to the value of the digit 2 in $5.02$?

    • A. It is 10 times greater.
    • B. It is 100 times greater.
    • C. It is 10 times smaller.
    • D. The values are the same.