This tutorial is suitable for use with a screen reader. Learn how to break up numbers into pairs of smaller numbers, eg 15 = 11 + 4. Work through examples of whole number pairs and sample questions. Apply these principles to solve additions or subtractions.
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
Creates problemswith reasonable answers involving multiplication or with addition or subtraction of whole numbers including money
Divides 3 to 4digit numbers by 1to 2digit numbers without and with remainder
Adds mentally 1 to 2digit numbers with sums up to 50 using appropriate strategies
Creates word problems involving addition and subtraction of whole numbers including money
Illustrates multiplication as repeated addition using groups of equal quantities arrays counting by multiples and equal jumps on the number line
Illustrates the commutative property of multiplication
Visualizes and represents division as equal sharing repeated subtraction equal jumps on the number line and using formation of equal groups of objects
Adds 3- to 4-digit numbers up to three addends with sums up to 10 000 without and with regrouping.
Copyright Information
Copyright
Yes
Copyright Owner
Education Services Australia
Conditions of Use
Reproduce, Use, Copy, Print
Technical Information
File Size
258.77 KB
File Type
application/x-rar
Software/Plug-in Requirements
Adobe Flash Player - http://get.adobe.com/flashplayer/
