Question 1: Calculate: 12.34 + 5.6

Answer: 17.94

Question 2: Add: 7.005 + 3.2

Answer: 10.205

Question 3: Calculate: 0.789 + 2.45

Answer: 3.239

Question 4: Add: 4.56 + 3.789

Answer: 8.349

Question 5: Add: 15.23 + 6.789

Answer: 22.019

Question 6: Calculate: 8.005 + 12.3

Answer: 20.305

Question 7: Add: 9.99 + 0.56 + 3.004

Answer: 13.554

Question 8: A shop sells 3.75 kg of rice, 2.45 kg of beans, and 1.89 kg of lentils. What is the total weight in kg?

Answer: 8.09

Question 9: If a car travels 123.45 km in the morning and 78.9 km in the evening, what is the total distance traveled?

Answer: 202.35

Question 10: A recipe requires 0.75 liters of milk, 1.2 liters of water, and 0.5 liters of juice. What is the total volume needed?

Answer: 2.45

Question 11: Calculate: 5.67 + 8.9 + 12.34

Answer: 26.91

Question 12: Add: 14.005 + 3.999 + 2.005

Answer: 20.009

Question 13: Identify and correct the mistake: 3.25 + 4.1 = 7.35 (Incorrect addition)

Answer: Correct answer is 3.25 + 4.1 = 7.35 (which is correct); mistake may be in initial calculation if different answer given. If student identifies mistake, they could explain that aligning decimals and adding properly gives 7.35.