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Comparing Fractions without using a number line
Ordering Fractions -
Comparing numbers directly, without using a number line, has many practical advantages because it does not require a physical drawing.
Although a number line provides a visual model which is easy to understand, it is not feasible to use it in most situations. The following limitations make a number line cumbersome and time consuming to use:
Comparing numbers directly eliminates the problems listed above. Direct comparison does not require a physical drawing.
- There is not enough space to physically plot more than a few numbers on the same line graph (number line).
- Plotting extremely small numbers, or extremely large numbers, or numbers with completely different orders of magnitude, or numbers which are almost equal may each require dramatically different labeling of scale marks. In addition, each situation may require completely different intervals marked on the number line.
Real Numbers are sequential. By comparing place values, any two numbers can be compared directly - once the numbers are written in the same standard notation.
How to Compare Numbers Using Direct Comparison - click description
. . . Fractions - Comparisons without using the number line:
Compare the fractions
(1) Convert the fractions so that both fractions have the same (common) denominator, then (2) compare the numerators with one another.
(1) Computing the Common Denominator
(2) Comparing the Numerators
is less than
is greater than