Explore how to break up numbers into pairs of smaller numbers such as 15 = 9 + 6. Work through examples of whole number pairs and sample questions. Apply these principles to solve additions or subtractions. Use a partitioning tool to break up numbers under 30. Recognize number patterns; use the strategy of counting on.
Objective
1.Students use a linear model to create number pairs of numbers between 10 and 30.
2. Students establish that larger numbers can be broken up into many pairs of smaller numbers.
3. Students investigate the commutative principle.
4. Students investigate the strategy of ‘counting on’ for addition and establish that it is preferable to count on from the larger number.
Curriculum Information
Education Type
K to 12
Grade Level
Grade 2, Grade 4, Grade 3
Learning Area
Mathematics
Content/Topic
Numbers and Number Sense
Intended Users
Educators, Learners
Competencies
Compares numbers up to 100 000 using relation symbols
Solves multistep routine and nonroutine problems involving multiplication and addition or subtraction using appropriate problem solving strategies and tools
Illustrates the properties of addition commutative associative identity and applies each in appropriate and relevant situations
Adds mentally 1 to 2digit numbers with sums up to 50 using appropriate strategies
Adds mentally 3digit numbers and 1digit numbers using appropriate strategies
Adds mentally three digit numbers and tens multiples of 10 up to 90 using appropriate strategies
Adds mentally 3digit numbers and hundreds multiples of 100 up to 900 using appropriate strategies
Creates problems involving addition of whole numbers including money
Creates problems involving subtraction of whole numbers including money
Performs orders of operations involving addition and subtractions of small numbers
Illustrates the commutative property of multiplication
Solves routine and nonroutine problems involving multiplication and addition or subtraction of whole numbers including money using appropriate problem solving strategies and tools
Visualizes and represents division as equal sharing repeated subtraction equal jumps on the number line and using formation of equal groups of objects
Estimates the difference of
two numbers with three to
four digits with reasonable
results.
Ubtracts mentally 1- to 2 –
digits numbers without and
with regrouping using
appropriate strategies.
Creates problems involving
addition and/or subtraction of
whole numbers including
money.
Copyright Information
Copyright
Yes
Copyright Owner
Education Services Australia
Conditions of Use
Reproduce, Use, Copy, Print
Technical Information
File Size
315.25 KB
File Type
application/x-rar
Software/Plug-in Requirements
Adobe Flash Player - http://get.adobe.com/flashplayer/
