Module 3 Number Flashcards
Ordinal Numbers
Used for ordering eg 1st, 2nd, 3rd, 4th
Cardinal Numbers
Used to indicate a quantity eg 1,2,3,4,5
Subitising
subitising involves the immediate recognition of the quantity of a collection of objects without having to count the objects.
Perceptual subitising
The immediate recognition of numbers up to 4
Conceptual subitising
with practice recognition of numbers can extend past 5 up to 10 where these numbers can be recognised in terms of there subitised parts (eg. 8 is seen as 1 more than 7, as 5 and 3 more as double 4, or as 2 more than 6).
Part – part – whole ideas:
Partitions a collection of numbers into two or more parts to add to a whole.
Number names and symbols
Number names need to be connected to collections and the symbols that represent them more formally:
Number naming sequence
Development of a stable ordered sequence of number names
One – to – one correspondence
Before learning to count a child needs to understand ‘one to one correspondence’. This means being able to match one object to one other object or person. You can practise ‘one to one correspondence’ in all sorts of different contexts. Laying the table is a good idea. The total count is important to understanding on-to-one correspondence.
Counting: Can refer to:
reciting the numbers names without reference to a collection,
To the physical act of enumerating a collection
To recognising that the last number says how many.
Match number words to objects in a one-to-one correspondence
Recognise invariance of cardinality (eg that three means three no matter what it looks like)
Numbers as composite units
Units made up of other units. Eg counting by larger units 5’s or 10’s.
Trusting the count
When they believe that counting the same collection will produce an invariant (never changing) result but also when they have access to a mental object for that number that renders counting unnecessary in most dealings with that number.
positional place value
Positional notation is distinguished from other notations (such as Roman numerals) for its use of the same symbol for the different orders of magnitude (for example, the “ones place”, “tens place”, “hundreds place”).
multi-unit place value
Understanding 34 as three tens and four, or 340 as 34 tens, is essential in using the multi-unit place value structure of numbers in carrying out the four operations.
Children calculate mentally through three procedures (in addition to developing an increasingly sophisticated concept of 10.
a mental replay of the written algorithm
2. Jump Method: a counting-based approach to building on (or decreasing) from one number in tens and ones
Split method: a collection-based approach, allowing separation and recombining of tens and ones.