Interactive Maths Links for the Australian Curriculum
• add three or more single-digit numbers
Interactive Magic Square
Add Single Digits to Make Target
Add Numbers to a Target Number – Battle Okta
Total less than 20 3 numbers
• model and apply the associative property of addition to aid mental computation, eg 2 + 3 + 8 = 2 + 8 + 3 = 10 + 3 = 1
Number Bonds to 40
Post Sorting Addition – Total, 20, 50 or add 3 Numbers
• apply known single-digit addition and subtraction facts to mental strategies for addition and subtraction of two-, three- and four-digit numbers, including:
− the jump strategy on an empty number line, eg 823 + 56: 823 + 50 = 873, 873 + 6 = 879
− the split strategy, eg 23 + 35: 20 + 30 + 3 + 5 = 58
− the compensation strategy, eg 63 + 29: 63 + 30 = 93, subtract 1 to obtain 92
− using patterns to extend number facts, eg 500 – 200: 5 – 2 = 3, so 500 – 200 = 300
− bridging the decades, eg 34 + 26: 34 + 6 = 40, 40 + 20 = 60
− changing the order of addends to form multiples of 10, eg 16 + 8 + 4: add 16 to 4 first
− using place value to partition numbers, eg 2500 + 670: 2500 + 600 + 70 = 3170
− partitioning numbers in non-standard forms, eg 500 + 670: 670 = 500 + 170, so 500 + 670 = 500 + 500 + 170, which is 1000 + 170 = 1170
* choose and apply efficient strategies for addition and subtraction (Problem Solving)
* discuss and compare different methods of addition and subtraction (Communicating)
Addition with 10s (Jump Strategy)
Jump Strategy Addition and Subtraction
(hover at top of page to choose activity)
Split/ Jump/ Compensation Strategy
Split 100s 10s and 1s
Addition on the Number Line Using Landmark Numbers
(Compensation Strategy)
Addition (Split Strategy)
Number Bonds to 40
Powerpuff Subtraction (multiple choice answers)
Bargain Hunt Addition
Add combinations from units to hundreds
Basketball Addition Game (range of levels)
Conveyor Belt Addition
Conveyor Belt Subtraction
CONTENT
Students:
Recall addition facts for single-digit numbers and related subtraction facts to develop increasingly efficient mental strategies for computation (ACMNA055)
OUTCOMES
A student:
› uses appropriate terminology to describe, and symbols to represent, mathematical ideasMA2-1WM
› selects and uses appropriate mental or written strategies, or technology, to solve problemsMA2-2WM
› checks the accuracy of a statement and explains the reasoning used MA2-3WM
› uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers MA2-5NA
Addition and Subtraction 1
• use concrete materials to model the addition and subtraction of two or more numbers, with and without trading, and record the method used
Number line can set numbers and increments,
and choose addition or subtraction
Interactive MAB blocks
MAB Subtraction Demonstration
• select, use and record a variety of mental strategies to solve addition and subtraction problems, including word problems, with numbers of up to four digits
* give a reasonable estimate for a problem, explain how the estimate was obtained, and check the solution (Communicating, Reasoning)
Word Problems with Katie
Maths at the Mall (Toys & Cafe)
Word Problem Index (large variety of Add/Sub problem types)
• use the equals sign to record equivalent number sentences involving addition and subtraction and so to mean 'is the same as', rather than to mean to perform an operation, eg 32 – 13 = 30 – 11
*check given number sentences to determine if they are true or false and explain why, eg 'Is 39 – 12 = 15 + 11 true? Why or why not?' (Communicating, Reasoning)
Build expressions to 100
Equivalence to 100
Recognise and explain the connection between addition and subtraction (ACMNA054)
• demonstrate how addition and subtraction are inverse operations
Number Bonds to 40
• explain and check solutions to problems, including by using the inverse operation
Number Bonds to 40
Word Problem Index
– large variety of Add/Sub problem types
Number line can set numbers and increments,
and choose addition or subtraction
Represent money values in multiple ways and count the change required for simple transactions to the nearest five cents (ACMNA059)
• calculate equivalent amounts of money using different denominations, eg 70 cents can be made up of three 20-cent coins and a 10-cent coin, or two 20-cent coins and three 10-cent coins, etc
Money Puzzles -
Give Change or Add/ Remove
Change Maker
• perform simple calculations with money, including finding change, and round to the nearest five cents
Money Puzzles -
Give Change or Add/ Remove
Change Maker
Change game (British money)
Maths at the Mall (Toys & Cafe)
• calculate mentally to give change
Money Puzzles - Give Change or Add/ Remove
Change game (British money)
Maths at the Mall (Toys & Cafe)
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