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Precision Software Appli…tions Silver Collection 1
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Precision Software Applications Silver Collection Volume One (PSM) (1993).iso
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children
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pc1games.exe
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1991-04-17
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4KB
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86 lines
MATHS6
This program moves on to adding and subtracting numbers and results upto
99. Sums are represented in the vertical format.
Execution
MATHS6 [<option>] [<max number>]
Where <Option> is blank for a random selection of addition and subtraction.
'-' for subtraction only. '+' for addition only.
<max number> allows MATHS6 to have higher limits than 99 for example you
might put in 999 or more. Eg for addition only with numbers upto 999 type:
MATHS6 + 999
Operation
The computer sets a sum and the user enters the result. The computer puts
the result in, starting from the right to encourage working in columns.
If the user presses <Space> or <C> the computer displays an additional
small red '1' in the next column to indicate a carry to that column.
Pressing <Del> or <Backspace> will clear the last number entered and if
necessary the carry.
To get the next sum press <Enter> or press <F10> to select the setup
screen.
The setup screen allows you to choose whether you get addition, subtraction
or both. It also shows the number of incorrect answers given.
Teaching Suggestions
This program builds on MATHS5 and introduces the concept of adding and
subtracting large numbers by working in units and tens columns.
Before going on to this program your child needs to be able to count
confidently upto 100.
You should teach your child to work from right (units) to left (tens) with
each column being treated as a separate sum and using a carry to indicate
addition or borrowing of ten from the next column.
For example adding 47 + 15 might go like this:
Have 7 fingers up (ie the 7 from 47) add on 5 (from the 15) by doing count
1 (put up the eighth finger), count 2 (put up the ninth finger), count 3
(put up the Tenth finger). We have ten so press <Space> or <C> to put in
the carry. This will result in a red '1' just above the 4. Then put all
fingers down. Count 4 (1 finger up), count 5 (2 fingers up). We have
reached 5 so how many fingers are up (there should be two!), so type in
'2'. This will go below the 7 and 5. Now we have to do the tens column so
start with 4. Add 1 for the carry (5 fingers up) add 1 (for the 1 of 15).
This should give 6 fingers up so type in '6'. The result is 62, and press
<Enter> to see if you are correct.
You may find problems when the result comes to exactly 10 on the first
calculation and you may need to explain that you can have to put in zero as
the answer.
Subtracting works in a similar way. For example 34 - 16 might go like
this:
Have 4 take away 6 so put up four fingers and count 1 taking away a finger
(3 fingers left), count 2 (2 fingers left), count 3 (1 finger left), count
4 (no fingers left). Press <Space> or <C> for a borrow from the tens
column. (Note This time the red '1' is placed under the 4 because it will
be taken away in a moment.) Having borrowed ten we can put up ten fingers
again and carry on, so count 5 (9 fingers left), count 6 (8 fingers). So
type in '8' which will go under the 4 and 6. In the tens columns we have 3
the borrow and the 1 from 16. So we have 3 (3 fingers up) take away 1 for
the borrow (2 fingers), take away the 1 (1 finger), type in '1' to get the
answer of 18.
One point of warning - I found that although my son could quite happily use
MATHS6, he had some trouble doing the same sums on paper. The reason for
this was that he was unable to accurately write the numbers and the carry
in columns. Therefore when you start on MATHS6 get your child to do
practice on paper as well! (See SUMWALL).
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