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"The Meaning of Ratio" Ratio and Proportional Distribution PPT Courseware 3
As can be seen from the above example:
The division of two numbers is also called the ratio of the two numbers.
5 to 4 is recorded as 5:4
240 to 5 is recorded as 240:5
"∶" is a ratio sign, pronounced as "bi".
The number before the ratio sign is called the preceding term of the ratio
The number after the ratio sign is called the consequent term of the ratio
The quotient of the former term divided by the latter term is called the ratio.
There are many interesting ratios in our human body:
The ratio of the length of a fist roll to the length of the sole of the foot is approximately 1:1;
The ratio of height to arms outstretched is approximately 1:1.
The ratio of adult height to head length is approximately 7:1.
The ratio of leg length to head length is about 4:1.
The ratio of a man’s shoulder width to his head length is about 2:1.
The ratio of a person’s blood to body weight is approximately 1:13…
After studying this lesson, do you understand the following knowledge? Give it a try, you can do it!
1. The division of two numbers is also called the division of two numbers ( ).
2. The number in front of the ratio sign is called the ratio ( ), and the quotient obtained by dividing the first term of the ratio by the latter term is called ( ).
3. From the relationship between ratio and division, the ratio ( ) is equivalent to the dividend of division, the ratio ( ) is equivalent to the divisor in division, and the ratio is equivalent to ( ).
4. From the perspective of the relationship between ratio and fraction, the antecedent term of ratio is equivalent to ( ) of fraction, the consequent term of ratio is equivalent to ( ) of fraction, and the ratio is equivalent to ( ).
1. Rewrite the following comparisons into another form according to the specified requirements.
2:9=2÷( )a:4=( ) ÷4=( ) / 4
2. Name the antecedent and consequent of each ratio below, and find the ratio.
0.9 : 0.4 36:18 4 decimeter: 20 centimeters
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