Question 1: Round 123.4567 to one decimal place.

Answer: 123.5

Question 2: A scientific measurement reads 0.98765 grams. Round it to one decimal place.

Answer: 1.0

Question 3: Estimate the value of 5.6789 km rounded to one decimal place.

Answer: 5.7

Question 4: The temperature is recorded as 23.456°C. Round to one decimal place.

Answer: 23.5

Question 5: A scientist measures 0.04567 liters. Round to one decimal place.

Answer: 0.0

Question 6: Plot the graph of y=2x for x from 0 to 5 (student draws on grid).

Answer: See full answer key

Question 7: Construct a triangle with sides 3.4 cm, 4.6 cm, and 5.2 cm, and measure the angles (student draws on grid).

Answer: See full answer key

Question 8: A measurement of 0.6789 grams is given. Round it to one decimal place.

Answer: 0.7

Question 9: A researcher records 98.765 meters. Round to one decimal place.

Answer: 98.8

Question 10: Error analysis: A student rounded 0.98765 to 0.98 instead of 1.0. Identify and correct the mistake.

Answer: The student should have rounded 0.98765 to 1.0, because the third decimal digit is 7, which rounds the second decimal digit 8 up to 9, resulting in 1.0.