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The part-adder

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TLF ID:

L220

Year level:

4-5

Learning object description:

Work through a series of five learning objects with strategies to help you do addition in your head. Use a linear partitioning tool to help solve addition sums such as 58+29. Split a sum into easy parts, work out each part and then solve the original calculation. Receive feedback and tips at every step from an animated character. Work through a comprehensive tutorial on multiplication strategies. There is also a non-interactive version of the tutorial, suitable for screen readers. This can be used by visually impaired students. 1. Generate easy sums (eg 28+9); 2. Generate hard sums (eg 58+27); 3. Make your own easy sums (eg 58+9); 4. Make your own hard sums (eg 43+29); 5. Go figure (tutorial suitable for screen readers).

Key learning objectives:

Students partition numbers to add numbers mentally.
Students use a linear model to add numbers mentally.
Students investigate strategies for adding numbers mentally.

Educational value:

Helps students develop mental strategies to simplify and solve addition problems.
Includes a partitioning tool where students rename numbers in terms of parts.
Provides hints giving explanations of mental strategies: ‘doubling’, ‘making to the next ten’, ‘using tens and ones’, ‘compensation’.
Provides explanations in support of the development of mental strategies to simplify and solve addition problems
Encourages repeated use by incorporating student-generated problems or randomly-generated problems
Provides an option to print a worksheet for each completed equation, containing the working out.

Learning area:

Science

Keywords:

Experimental design; Experiments; Fair tests; Hydroponics; Light; Lighting; Nitrogen; Peas; Plant growth; Salinity; Temperature; Vegetables

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