EXERCISES IN MENTAL COMPUTATION AND
FOR PRIMARY SCHOOL CHILDREN
(RECOMMENDED FOR AGES 8-9 / YEAR 2 AND YEAR 3)
TABLE OF CONTENTS:
Work Out 1: Use a known fact - multiple of 10.
Work Out 2: Count on - multiples of 10 and any number.
Work Out 3: Use doubles - with/without regrouping.
Work Out 4: Add the parts - no regrouping.
Work Out 5: Use place value - regrouping.
Work Out 6: Make a ten - adding two-digit numbers.
Work Out 7: Round or adjust - rounding one addend.
Work Out 8: Use Compatible pairs - four addends
Make your choice...
How to use this web exercises...
The activities within each page have been developmentally sequenced. This allows teachers to work through the page from the beginning to the end. Alternatively, a confident teacher may want to develop his or her own sequence by drawing on related activities from the different sections of the page. For example, after completing the doubling activities for addition, the teacher may want to focus on the idea of using related doubles to subtract.
The students should be 'walked' through the activity on the pages and encourages to share their strategies and methods of computation.
Work Out page can sharpen student's mental skill. Ask them to complete all of the pages. This can be done in school time or as set homework. It is important to correct this page as a class. This will give the students further opportunities to share their strategies and to explain their thinking.
It is important to know how confident and competent students are at using a particular strategy. This information can be used to judge whether they need further experiences with that strategy, or if they are ready to progress to the next strategy.
Essential skills still lacking
The general aptitude of Malaysian students in mathematics and science – subjects which are widely recognised as the scientific and technical building blocks of an economy – is not only below the international scale average, but is also on a declining trend.
As Malaysia works towards moving up the value chain, the need for knowledge, innovation and technology becomes more pronounced. Yet, studies have shown that the foundation on which these three elements are built remains weak in the country.
According to the latest Trends in International Mathematics and Science Study (TIMSS) 2011, the general aptitude of Malaysian students in mathematics and science subjects which are widely recognised as the scientific and technical building blocks of an economy is not only below the international scale average, but is also on a declining trend.
Findings of the global benchmarking studies, which were released over the week, showed that Malaysian students at Form Two level scored an average of only 440 points in mathematics and 426 points in science. This compared with the TIMSS scale average of 500 points for both subjects.
The same study done in 2007 showed 14-year-old Malaysians' score to be at an average of 474 points for mathematics and 471 points for science, which were also below the scale average then.
But the same study done in 2003 showed that Malaysian students had indeed performed far better, scoring above the scale average on both subjects, and even surpassing that of their peers in the United States in mathematics. (Malaysian students then scored an average of 508 points for mathematics and 510 points for science.) Read more..