1. Adding and Subtracting Decimals

2. Steps to Add and Subtracting: 1) Stack the decimals 2) Line them up by their decimal points 3) Add zeros to any empty place values 4) Add or subtract like normal 5) Bring decimal straight down in your answer

3. Adding Decimals 23.1 + 5.8 18 + 1.23 54.7 + 21.2 0.63 + 10.251

4. Subtracting Decimals 5.6 – 3.5 19.84 – 4.26 9.27 – 3.143 58-7.53 10 – 0.5 74.84 – 73.23

5. Question 1  The water table is where the zone of aeration and zone of saturation meet. If the water table is 100.45 ft deep and the zone of aeration is at a depth of 45.23 ft, what is the total depth?

6. Question 2 Marcus is 1.5 meters tall. His sister, Carol, is 0.1 meter taller than Marcus. Their father is 0.2 meters taller than Carol. How tall is Carol? How tall is their father?

7. Question 3 Jennifer brought $14.75 to the baseball game. She spent $3.45 for a hot dog and soda. How much money does she have left?

8. Question 4  A balloon was inflated to have a diameter of 15.4 inches before the party began. A week later the balloon had deflated to have a diameter of 10.7 inches. What is the difference in the diameters of the balloon?

9. Question 5 Allie rides her bike to school which is 1.2 miles away. If she stops at her friend Jessica’s house which is.5 miles from her house. How much farther does she need to ride to get to school?

10. Question 6 Andrew weighs 83.42 pounds. His twin brother, Christopher, weighs 87.12 pounds. How many more pounds does Christopher weigh?

11. Question 7 Kendall the tiger recently got weighed. He weighed 306.78 pounds. His companion, Wilson, weighed 38.49 pounds more. How much did Wilson weigh in pounds?

12. Question 8  Daniel had saved $105.65. He gave away $34.08 to charity and bought a new bike helmet for $29.97. How much money in dollars and cents did he have left over?

13. Closure  Create your own addition or subtraction word problem and solve it. Explain in words how you know your answer is correct?