FOURTH GRADE / MATHEMATICS / FRACTIONS 1.1
MATHEMATICS IS EASY. PROVIDED THAT ONE WORKS ENOUGH .
ENOUGH IS SKILL DEPENDENT, HAVE TO FIND "ENOUGH" FOR YOUR SIZE.
Numerator is a natural number.
Unit is the great rectangle that is divided into 15 pieces .
Unit fractions are the colored (for differentiation, not disturbing equality) small rectangles.
To determine the denominator we need to count all of the circles ! 4 of the groups contain 7 circles (circular regions).
Reduction is the division of both the numerator and the denominator by the same number .
Make the minutes the common units at both sides to get (p/15)x60=24 .
The white and purple areas are equal .
Area of the red region is 64/128 units .
7/357 = 1/51.
reductions of 1/2 is not well defined.
Look at the page : "http://wiki.zum.de/Mathematik-digital/Bruchteile_bestimmen" !
Usually denominators should be the same for comparison ....
But in this case tthe numerator and the denominator are being increased by the same amount (2) and the one with the greatest numerator will be ... .
1/3 + 1 = 4/3 and 1/2 + 1 = 3/2
4/3 < 3/2 .
2/3 = 8/12 ve 4/7 = 12/21 i.e. 3/12 x 15/21 .
simple q. .
4/32 = x/100 . Should be rounded to the nearest ten !
Since the denominator is 100 we only need to multiply both sides by 5 .
8 minutes are 480 seconds .
When we add fractions we get 41/35, an improper fraction. As a mixed number it is 1 + 6/35 .
The sum of the natural numbers from 1 to 4 is 10 .
Numerator could be defined to be writen below the division sign but both way correct results can not be attained.
There remains 3.9 tons after the first sale.
The equality y/8 = 2 . y - 440 is valid .
Let the original number of nuts be F.
Alper ate F/4 and there remains 3F/4 .
Ali ate 3F/16 .
What is the total amount they ate and what remained ? .
The image gives clue. If a worker finishes the job in 6 hours, in one hour he makes 1/6 of it .
For two workers add 1/6 and 1/5 which makes 11/39 and this is the part of the job done in an hour.
The equation m - m/3 - m/18 = 420 should be valid .
1/5 th of the money should be $ 10 000 .
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