Question 1: Round 3.456 to 1 decimal place.

Answer: 3.5

Question 2: What is the lower bound when 7.89 is rounded to 1 decimal place?

Answer: 7.85

Question 3: Calculate the upper bound for 12.3 rounded to 1 decimal place.

Answer: 12.35

Question 4: Round 9.876 to 1 decimal place and state the bounds.

Answer: {"rounded":"9.9","lower_bound":"9.85","upper_bound":"9.95"}

Question 5: A measurement is 6.254 meters. Round to 1 dp and state the lower and upper bounds.

Answer: {"rounded":"6.3","lower_bound":"6.25","upper_bound":"6.35"}

Question 6: A calculator displays 15.6789. Round this to 1 decimal place and find the range of possible actual values.

Answer: {"rounded":"15.7","lower_bound":"15.65","upper_bound":"15.75"}

Question 7: Plot the graph of y = 2x for x from 0 to 5, with x rounded to 1 decimal place.

Answer: Students will draw the graph accordingly.

Question 8: Construct a triangle with side lengths 4.56, 7.89, and 10.23, rounding each to 1 decimal place. Write down the rounded lengths and possible range for each side.

Answer: [{"side":"4.56","range":["4.55","4.65"],"rounded":"4.6"},{"side":"7.89","range":["7.85","7.95"],"rounded":"7.9"},{"side":"10.23","range":["10.15","10.25"],"rounded":"10.2"}]

Question 9: Solve: 5.678 rounded to 1 dp, then find the lower and upper bounds of the original number.

Answer: {"rounded":"5.7","lower_bound":"5.65","upper_bound":"5.75"}

Question 10: Identify the mistake: A student rounds 2.349 to 2.4 and states the lower bound as 2.3. Correct the mistake and give the proper bounds.

Answer: Correct bounds are 2.345 to 2.354; student should have used 2.345 as lower bound.

Question 11: Estimate the cost if a product costs £14.567, rounded to 1 dp. State the lower and upper bounds for the cost.

Answer: {"rounded":"14.6","lower_bound":"14.55","upper_bound":"14.65"}