Adding and Subtracting Decimals

Steps to Add and Subtracting:

1) Stack the decimals2) Line them up by their decimal

points3) Add zeros to any empty place

values4) Add or subtract like normal5) Bring decimal straight down in

your answer

Adding Decimals

23.1 + 5.8

18 + 1.23

54.7 + 21.2

0.63 + 10.251

Subtracting Decimals

5.6 – 3.5

19.84 – 4.26

9.27 – 3.143

58-7.53

10 – 0.5

74.84 – 73.23

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?

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?

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?

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?

Question 5Allie 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?

Question 6 Andrew weighs 83.42 pounds. His twin brother,

Christopher, weighs 87.12 pounds. How many more pounds does Christopher weigh?

Question 7Kendall 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?

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?

Closure Create your own addition or subtraction word

problem and solve it. Explain in words how you know your answer is correct?