Real numbers, approximation and significant figures

Question 1 of 10

Write 242,658 correct to 2 significant figures: ___

Question 2 of 10

Write 243,458 correct to 2 significant figures: ___

Question 3 of 10

Every recurring decimal is irrational.

Question 4 of 10

(a) Calculate 1.3 × 3.1 exactly. (b) Estimate the answer by rounding each number to the nearest whole number. (c) Find the percentage error of the estimate, correct to 1 decimal place.

Question 5 of 10

Write 7,470.7 correct to 2 significant figures.

Question 6 of 10

(a) Calculate 9.8 × 3.1 exactly. (b) Estimate the answer by rounding each number to the nearest whole number. (c) Find the percentage error of the estimate, correct to 1 decimal place.

Question 7 of 10

Round 686.95 to 2 decimal places.

Question 8 of 10

Write 1,434.47 correct to 2 significant figures.

Question 9 of 10

Express 0.7 recurring (0.777…) as a fraction.

Question 10 of 10

The reciprocal of 5 is 0.2.