Question 1: Round 0.004567 to 2 significant figures.

Answer: 0.0046

Question 2: Round 123.456 to 2 significant figures.

Answer: 1.2×10^2

Question 3: Calculate 0.00789 rounded to 2 significant figures.

Answer: 0.0079

Question 4: Estimate the value of 9876 when rounded to 2 significant figures.

Answer: 1.0×10^4

Question 5: A car's speed is 123.45 km/h. Round this to 2 significant figures.

Answer: 1.2×10^2 km/h

Question 6: In a recipe, 0.000456 grams of salt is used. Round this to 2 significant figures.

Answer: 0.00046

Question 7: Calculate 4567.89 rounded to 2 significant figures.

Answer: 4.6×10^3

Question 8: A scientist records a measurement of 0.00012345 meters. Round to 2 significant figures.

Answer: 0.00012

Question 9: A bank reports an amount of $12345.67. Round this to 2 significant figures for reporting.

Answer: $1.2×10^4

Question 10: Construct a number on the grid that, when rounded to 2 significant figures, equals 0.0056.

Answer: 0.00559

Question 11: Identify and correct the mistake: Rounding 0.004567 to 2 sf gives 0.045.

Answer: The correct rounded value is 0.0046, not 0.045.

Question 12: A piece of equipment measures 0.00098765 meters. Round to 2 significant figures and explain your process.

Answer: 0.0010; since 9.8765 rounds to 1.0 when considering 2 sf, and the position is in the thousandths place, the result is 0.0010.