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Youngsters have problems in understanding which Excel formula they should use. Youngsters do not comprehend the Excel formulas.

Stumbling Blocks: mathematics | statistics

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    Subject: Technology | Country: Portugal

    Youngsters have problems identifying the rule they should apply. Youngsters do not know the signification of the Excel function "IF".

    Stumbling Blocks: function | logic | vertical demand

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      Subject: Technology | Country: Portugal

      Youngsters have problems understanding the practical application.

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        Subject: Technology | Country: Portugal

        Use and practical application of conditions in loops (several times) versus if structures (once).  But it's not just conditions that students stumble over; it's understanding the problem in the first place.   Then, within a loop they might have:

        • a complicated condition, e.g. using %2==0 as a test for even numbers when they need only increment in twos.
        • output from within the loop rather than once after the loop
        • use a dialog when the instructions are to use print out
        • use non-self-descriptive identifiers e.g. 'sum' when they're asked to total something and thus might better call it 'total'
        • get the wrong start and stop values, e.g. 0 to start a loop to 100, but stop at 100 instead of <100, or loop 50 times instead of 100 times

        So a quiz might be:

        • What's being calculated?
        • Calculate it manually for a smaller number range, e.g. 1 to 10 instead of 1 to 100
        • How many numbers meet the criteria?
        • How much should you increment on each loop?  by 1, 2 minus 1? minus 2?  Why?
        • if you add all even numbers between 1 and 10 what do you get?
        • How many even numbers are there between 1 and 10?
        • How many odd numbers are there between 1 and 10?
        • What might you start from: 1?  2?
        • How often should you print.?
        • Write a loop to print the two times table from 1 to 12.

         

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            Subject: Technology | Country: United Kingdom

            Java Collections require use of objects, themselves a tricky topic.  The Collections objects are implemented using Interfaces and there is a mapping between the Interfaces and the Collections, e.g. HashMap and Map.

            Then there is the need to iterate over Collections, which might be tricky for some students.

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                Subject: Technology | Country: United Kingdom

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                Subject: Technology | Country: United Kingdom