Question 1: Calculate the total amount spent if $12.45 is spent on groceries and $5.30 on snacks. How much money was spent altogether?

Answer: 17.75

Question 2: A water tank was filled with 48.7 liters of water. After some use, 12.3 liters remain. How much water was used?

Answer: 36.4

Question 3: Subtract $15.6 from $50.0. What is the result?

Answer: 34.4

Question 4: A cyclist traveled 75.8 km in the first day and 63.4 km on the second day. How much further did they travel on the first day?

Answer: 12.4

Question 5: In a store, a shirt costs $23.45 and a pair of shoes costs $54.99. If a customer pays with $100, how much change will they receive?

Answer: 21.56

Question 6: A factory produced 125.7 units of a product in the morning and 98.4 units in the afternoon. How many units did it produce in total?

Answer: 224.1

Question 7: A customer bought 3.2 kg of apples and 2.5 kg of oranges. How many kilograms of fruit did they buy in total?

Answer: 5.7

Question 8: Construct a line segment on the grid that measures exactly 4.7 units in length.

Answer: Students draw a line segment measuring 4.7 units.

Question 9: Plot the graph of y=2x for values of x from 0 to 5. Label the points.

Answer: Students plot points (0,0), (1,2), (2,4), (3,6), (4,8), (5,10).

Question 10: A bakery made 150.3 grams of bread dough in the morning and 87.8 grams in the afternoon. How much dough was made in total?

Answer: 238.1

Question 11: A store had 500.0 grams of sugar. After baking, 370.4 grams remained. How much sugar was used?

Answer: 129.6

Question 12: Identify and correct the mistake: A student subtracts 15.7 from 20.4 and writes 4.7 as the answer.

Answer: Incorrect. 20.4 - 15.7 = 4.7, which is correct; students should verify subtraction steps.