Topic: Ratio: population issues
Reference: Macmillian champion primary mathematics book 6
Previous knowledge: Pupils are familiar with Ratio and proportion.
Objective: At the end of the lesson pupils should be able:
Population and Facilities
Government allocates money in their budgets to provide facilities for the population. In Nigeria, we have three types of government. They are:
Example 1: a local government area (LGA) has a population of 87 000 people. A sum of N26 100 00 is to be spent on health care in a year. Calculate the amount of number allocated for each citizen.
Ratio of people to the money allocated is = 87 000: 261 000 00
= 87: 26 100 (divide by 1000)
= 29: N8 700 (divide by 3)
= 1: N300 (divide by 29)
The amount of money allocated on health care for each citizen is N300.
Lesson 2: ratio of children to family
Example 1: the total number of children in a community of 24 families is 96. Calculate the ratio of children per family.
Ratio of children per family = 24 families: 96 children
Divide both by 24
∴ There are 4 children per family
Lesson 3: ratio of birth to death
Birth rate is expressed as the number of birth per 1000 in a population. Fertility rate is the number of children born per woman in a population. Death rate (morality rate) is expressed as the number of death per 1000 in a population.
Example 1: if 5076 children were born in a year in a city with population 141 000, calculate the birth rate.
Ratio of population to number of birth 36
Divide both by 141
Step I: Teacher revises previous lesson with pupils
Step II: Teacher introduces and explain new topic to pupils
Step III: Pupils are allowed to ask questions
Step IV: Teacher writes note on the boards for pupils
Ratio of population to number of birth
157 000:5 966
Divide both side by 157
That is, the birth rate is 38 birth /1000
Conclusion: Teacher moves round for inspection, marking and correction of notes where necessary.
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