Proportion
Use when two ratios represent the same relationship, such as constant price per unit or scale.
Translate the situation first. Calculate second.
Turn real situations into mathematical models using rates, percentages, money, distance, geometry, and multi-step reasoning. These practice categories focus on the part of word problems that matters most in high school: deciding what the quantities mean and how they are related.
Each category is organized around a different type of applied reasoning. The goal is not only to get a numerical answer, but to recognize which quantities belong in the model and why.
Practice unit rates, direct variation, proportional relationships, scaling, and comparison problems.
Solve percent increase and decrease, reverse percentages, repeated changes, discounts, and markups.
Work with prices, tax, discounts, simple interest, budgets, wages, profit, and multi-step financial situations.
Model constant speed, average speed, travel in opposite directions, catch-up problems, and time relationships.
Translate real situations into equations involving area, volume, similarity, scale, dimensions, and measurement.
Combine several quantities, constraints, equations, percentages, rates, and intermediate results in one problem.
A word problem is a modeling task. Before calculating, decide what is unknown, what information matters, and what mathematical statement connects the quantities.
What quantity does the question actually ask you to find? Name it before doing arithmetic.
Use a variable with meaning: t for time, x for an unknown amount, or another clear choice.
Write 72 km/h, $1,200, 8%, or 15 m² rather than treating values as unitless numbers.
Describe in words how the quantities interact before converting the relationship into symbols.
Use an equation, proportion, formula, table, or system that matches the structure of the situation.
State the answer with units and check that it satisfies every condition in the original problem.
Different stories can hide the same mathematical model. Recognizing the underlying relationship is what makes word-problem skill transferable from one context to another.
Use when two ratios represent the same relationship, such as constant price per unit or scale.
Use when a quantity grows, decreases, is discounted, taxed, marked up, or compared by percent.
Use when one quantity changes at a constant rate with respect to another quantity.
Use when several conditions constrain one or more unknown quantities at the same time.
These examples show the level this section is designed around: the calculations are manageable, but only after the situation has been translated into the correct mathematical relationship.
The sale price is 84% of the original price. Subtracting 16% of 126 would use the wrong base.
The first cyclist has a 27 km head start. The second gains on the first at 12 km/h.
This is not an “area formula only” problem because both dimensions are unknown but related.
Memorizing “of means multiply” or “more means add” is not enough for serious word problems. Interpret the complete relationship and check which quantity each phrase modifies.
The same vocabulary can appear in different structures. Read the full sentence, identify the quantities, and ask what relationship the sentence is actually asserting.
Often indicates a rate, such as dollars per hour or kilometers per liter. The units tell you which quantity is divided by which.
Means multiply the original quantity by 1.20. It is different from “is 20% of,” which uses a multiplier of 0.20.
Represents x + 4, but “4 times as much as x” represents 4x. Similar wording can encode very different relationships.
Includes the boundary value and values above it, so it commonly translates to ≥ rather than >.
When reviewing a missed word problem, locate the first point where the mathematical model stops matching the story. That is more useful than only checking the final arithmetic.
A problem may give enough information to find several values, but only one of them answers the actual question.
Discounts, taxes, markups, and repeated changes may use different bases at different stages.
Minutes and hours, centimeters and meters, or dollars and cents must be converted before they can be combined consistently.
The strongest word-problem skill is not faster calculation. It is recognizing what the quantities mean, how they relate, and which model preserves that relationship.
Identify what the problem is asking for and define the unknown quantity clearly. Then list the known quantities with their units and look for a mathematical relationship connecting them. Avoid calculating before you know what each number represents.
Keywords can provide clues, but they are not a complete solving method. The same word can appear in different mathematical structures. It is safer to identify the quantities, units, constraints, and relationship before choosing an operation or equation.
Choose the model that matches the relationship. Use a proportion when two ratios are equal, an equation when an unknown quantity is constrained by other quantities, and a formula when the situation matches a known relationship such as distance = rate × time or a geometric area formula.
Substitute the result back into the original situation. Check units, sign, magnitude, and all stated conditions. An algebraically correct number can still be wrong if it does not answer the quantity the question actually asks for.
Units reveal the meaning of a calculation. For example, miles divided by hours gives miles per hour, while dollars divided by items gives dollars per item. Tracking units helps identify which operations are sensible and catches many setup errors.
The section is designed around applied reasoning used in high school math: percentages, rates, distance, financial math, geometry, and multi-step situations. The goal is to practice modeling and interpretation rather than only basic arithmetic.
Start with one of the six word-problem categories. Define the unknown, keep the units visible, write the relationship before calculating, and check the result against the original situation.