**Week 7**

**Subject: Mathematics**

**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:

- Find amount of money of money allocated for health care of individual citizen in a year.
- Express number of children per family in ratio form.

**Content**

**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:

- Local government area
- State
- Federal government

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.

**Solution**

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.

**Solution**

Ratio of children per family = 24 families: 96 children

Divide both by 24

1:4

∴ 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.

**Solution**

Ratio of population to number of birth 36

141 000:5076

Divide both by 141

1000:36

846

846

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**Presentation****:**

**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

**Evaluation:**

- A total of 5966 children were born in a year in a city with population 157 000. Calculate the birth rate.

Ratio of population to number of birth

157 000:5 966

Divide both side by 157

1000:38

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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