welcome link Teaching section Case Studies section background section test find

 


You are using the online sample of the Teaching and Learning about Decimals CDROM. Not all linked pages are accessible in this version. For further information about the complete CDROM please click here.

Problems for children from different backgrounds

Contents of this page

Decimal markers and thousands separators
Language Differences

Decimal markers and thousands separators

In different countries around the world, different symbols are used to mark the decimal part of the number and to separate the thousands. In Australia today we use a decimal point and a space (as a thousands separator), but until the 1970's the accepted notation was a comma as a thousands separator. Not only are different symbols used as decimal markers and thousands separators but they can also be used to convey completely different meanings, i.e. in some cultures a point is used to indicate multiplication. It is important to realise that children from other countries may be accustomed to different notation, making it difficult for them to read and understand numbers in the Australian classroom. Some variation is often also found within a country. The decimal point in Australia (and elsewhere) used to be above the line, but with widespread computer use they are now generally on the line, as in this resource. Below is a table giving an example of notation from several countries.

COUNTRY

NOTATION

Australia today 12 345.67
Australia pre 1970's 12,345.67
Italy, Argentina, Portugal, Vietnam 12.345,67
Philippines 12345,67
Greece 12,345.67
Hong Kong, Singapore 12,345.67
France 12 345,67
International system of units (SI units) 12 345.67

TRAVELLER'S DILEMMA
YOU HAVE HAD A MEAL IN A RESTAURANT IN PORTUGAL. THE BILL IS 17.356,00
HOW MUCH IS THIS?

Language Differences

Difficulties in learning decimals (eg Reverse thinking) can also stem from differences in children's first language. For example, Asian language speakers have to make a special effort to indicate the presence of a 's' at the end of an English word as it is not their accustomed way of pluralising. Many Europeans (especially Italian and French) hear 'th' and 'sss' or 'th' and 'd' as too close to distinguish easily. This may cause them to blur them into one sound unless specifically urged not too. Blends such as that which occurs at the end of the word 'hundredths' would not be distinguished easily by most non-English background speakers. Remember that English speakers cannot hear all the sounds in other languages either.

To overcome these problems requires firstly their recognition and subsequently exposure, practice, assistance and encouragement.

Words that are especially hard to say and hear:
ten, tens, tenth, tenths
hundred, hundreds, hundredth, hundredths
place, base, pace
six, sixth, sixths
To help overcome these problems, teachers need to:
articulate consonants clearly (exaggerating if necessary)
write potentially unclear words on the board
give students practice in saying and hearing the words.
Reference: MacGregor & Moore (1991) provides much more information on cultural differences in mathematics.


For information about this page, contact: Vicki Steinle
Contact Email Address: v.steinle@unimelb.edu.au
Department Homepage: www.edfac.unimelb.edu.au/DSME
Faculty Homepage: www.edfac.unimelb.edu.au/
Last modified: Fri 21 September 2012

This page, its contents and style, are the responsibility of the author and
do not represent the views, policies or opinions of The University of Melbourne.