This Mathematics unit covers a range of mental computation strategies for addition.
It consists of 8 lessons of approximately 60-minutes duration.
The sequence of lessons and suggested time frames should be regarded as a guide only; teachers should pace lessons in accordance with the individual learning needs of their class.
An assessment task for monitoring student understanding of the unit objectives is included and will require an additional lesson.
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Add and subtract two- and three-digit numbers using place value to partition, rearrange and regroup numbers to assist in calculations without a calculator
Recognise and explain the connection between addition and subtraction as inverse operations, apply to partition numbers and find unknown values in number sentences
Extend and apply knowledge of addition and subtraction facts to 20 to develop efficient mental strategies for computation with larger numbers without a calculator
Apply place value to partition, rearrange and regroup numbers to at least 10 000 to assist calculations and solve problems
Recognise and explain the connection between addition and subtraction
Recall addition facts for single-digit numbers and related subtraction facts to develop increasingly efficient mental strategies for computation
ProblemSolving - selects and uses appropriate mental or written strategies, or technology, to solve problems
Reasoning - checks the accuracy of a statement and explains the reasoning used
WholeNumbers - applies place value to order, read and represent numbers of up to five digits
AdditionandSubtraction - uses mental and written strategies for addition and subtraction involving two-, three-, four- and five-digit numbers
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My students ADORED this unit. If more maths units like this could be put together, that would be amazing!
Hi Karina, Thank you so much for your lovely feedback! I am so glad your students enjoyed uncovering the mystery in the Addition Detectives unit. We will definitely take your suggestion into consideration when making our future units! Thanks again!
Hi Joanne, The link is now included in the text of the lesson plan. Clicking on the hyperlink should take you directly to the video.