Unit 3 sec 4.1
what is a ratio
12 November 2015
23:40
Why say the ratio
of oil to vinegar is 3:1.
This ratio is equivalent to
30: 10, and 120:40,
and 1.5:0.5
ratios can contain more than 2 numbers. For example, to make
a particular type of concrete you need one part cement into parts sand for
parts gravel.
1:2:4
you could make one shovel full of cement to shovel full of
sand and for shuffleboard gravel and by several foes of cement with tens shovel
films of sand and 20 shovel films of gravel and someone depending on how much
concrete you need.
This is the ratio
between the distance on number and the corresponding distance on the ground. The
ratio is changed to an equivalence ratio in the same way that fraction is
changed to an equivalent fraction.
To find a ratio equivalent to a given ratio
multiply or divide each number in
the ratio by the same non-0 number.
A ratio is simplest
form, when each number in the ratio is a whole number, and these numbers
are collected down as much as possible, that is, they have no common factors.
When you are working with ratios that contained 2 numbers,
it is sometimes helpful to convert them to the form number 1. For example, this
can help you compare different ratios. You can convert a ratio to this form. By
dividing both numbers by the 2nd number.
Rating ratios in the form number :1 also help you to find
approximate ratios, which can be useful when you want to compare quantities. Sometimes
you need to divide a quantity in a particular ratio
Other forms of ratio
ratios icon changes to numbers are sometimes written as
fractions. For example, the ratio 3:2 can be written as a fraction. The 1st
and 2nd number in the ratio become the numerator and denominator of
the fraction, respectively. This is why you sometimes see ratios given as
single numbers. The single number that represents a ratio is just a number that
is obtained when the ratio is written in the form ‘number :1’.
The fact that ratios can be written as single numbers. Also
explains why you often see phrases such as the larger ratio.
These are great notes. I would just say are you using a predictive text tool as there seems to he confusing words sprinkled in notes. This doesn't detract from usefullness of notes as what you are trying to say can be understood. I just thought I would let you know. 😆
ReplyDeletei am having to change because the math examples r not showing up. iwhen i put them on the computor i am using dragan. i am picking out the the most importent stuff and putting then in the blog
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