Profit, cost, and taxes

Work out profit, cost and break-even from fixed and variable costs and tell the kinds of taxes apart

Problem types

The four operations with decimals
Multi-operation word problems · Useful idea
Buying, selling and paying costs are several operations in order, and the result is profit or what is left.
Two-step word problems · Useful idea
Costs and incomes in two steps give the amount left or the profit.
Add two-digit numbers · Useful idea
Adding two-digit prices and costs finds the amount spent, and subtracting it from income finds profit.
Equations for addition and subtraction stories · Useful idea
Profit stories join and separate money amounts: income is added, cost is taken away, and the difference tells whether there is a gain or a loss.

Income tax, budgets, and net worth
Linear models of a situation · See it applied
Saving or paying a fixed amount each week is a linear model with a starting amount and a rate.
Building an exponential model · Extend the idea
Money that earns interest grows by a percent of what is there, so unlike fixed saving it follows an exponential model.

Open the interactive map to explore lessons and skill connections.