Household arithmetic - JSS2 Mathematics Lesson Note

Household arithmetic refers to the mathematical operations used in everyday home activities. This includes tasks like budgeting, cooking, and shopping. Here are a few examples:

Example 1: Budgeting

Suppose you have a monthly income of $3,000 and you want to allocate it to various expenses.

Rent: $1,000

Groceries: $400

Utilities: $150

Transportation: $200

Entertainment: $100

Savings: $250

Calculations:

Total expenses=Rent+ Groceries+ Utilities+ Transportation+ Entertainment+ Savings

=1000+400+150+200+100+250=2100

Remaining amount=Income−Total expenses=3000−2100=900

You have $900 remaining for other needs or unexpected expenses.

Example 2: Cooking

A recipe requires 3/4 cup of sugar, but you want to make a batch that is twice as large.

Calculations:

Sugar needed:=2×¾=2×0.75=1.5 cups

You will need 1.5 cups of sugar.

Example 3: Shopping

You buy 3 items that cost $15, $20, and $12. You want to know the total cost and how much change you'll get from $50.

Calculations:

Total cost=15+20+12=47

Change=50−47=3

You will spend $47 and get $3 back in change.