Writing ordinary numbers 0 Overview Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about writing standard form numbers in ordinary form. Question 1Change answer Write the numbers below in ordinary form. Write the numbers below in ordinary form. a) New Zealand has a total of 9.2 × 104 kilometres of roading. Ordinary form: kilometres b) New Zealand has 2.46 × 106 registered vehicles. Ordinary form: vehicles c) The government spends $6.897 × 108 on roading each year. Ordinary form: $ Question 1Change answer d) The thickness of a key is 2 × 10-3 metres. Write this in ordinary form: metres Question 1Change answer e) The probability of one set of numbers winning lotto is 2.6 × 10-7. i) Write the probability in ordinary form ii) and as a percentage: % Level: 5 Curriculum info: Maths, Number and Algebra, Number Knowledge, Number Strategies Keywords: standard form Description of task: Students write standard form numbers in ordinary form. Answers/responses: Y10 (10/1998) a) 92 000 easy b) 2 460 000 easy c) 689 700 000 easy d) .002 moderate e) .00000026 moderate Diagnostic and formative information: Common error Likely reason a) b) c) 9.2000 2.460000 6.89700000 Inserts a decimal point in wrong position but has correct number of zeros if decimal point was excluded. d) e) ⁻2000 ⁻26000000 Takes negative power to mean negative number rather than decimal fraction. d) e) 000.2 000000.26 Decimal point in wrong place. d) e) 002 00000026 Missing decimal point. Working with standard form Working with standard form II Writing standard form Writing ordinary numbers II Faster than light Ordering standard form Microscopic numbers
