"The Meaning of Ratio" Ratio and Proportional Distribution PPT Courseware 2

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"The Meaning of Ratio" Ratio and Proportional Distribution PPT Courseware 2

The division of two numbers is also called the ratio of two numbers.

Self-study outline:

1. How to read and write ratio.

2. What are the names of each part of the ratio?

3. How to find the ratio of a ratio?

4. How can the ratio be expressed?

In the ratio of two numbers, the number before the ratio sign is called the antecedent term of the ratio, and the number after the ratio sign is called the consequent term of the ratio. The quotient obtained by dividing the first term of a ratio by the latter term is called the ratio.

Ratios are usually expressed as fractions. If they are divisible, they can also be expressed as decimals. If they are divisible, they can be expressed as integers.

Do it

A can walk 15 kilometers in 3 hours, and B can walk 24 kilometers in 4 hours.

(1) The ratio of A’s distance to A’s time is ( )

(2) The ratio of B’s distance to B’s time is ( )

(3) The ratio of A’s distance to B’s distance is ( )

(4) The ratio of A’s time to B’s time is ( )

Think about it:

1. What are the antecedent term, the consequent term and the ratio equivalent to the division equation and fraction respectively?

2. What is the difference between ratio, division, and fractions?

3. Can the consequent term of the ratio be 0?

Interesting ratios in the human body

Roll your fist around, the ratio of its length to the length of the sole of your foot is approximately 1:1

The ratio of height to arms outstretched is approximately 1:1

The ratio of leg length to head length is about 4:1

The ratio of foot length to height is 1:7

The ratio of blood to body weight is approximately 1:13

The ratio of shoulder width to head length for an adult man is 2:1

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Update Time: 2024-09-14

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