CALCULATION GUIDES
Learn the method, then use the tool.
Short practical guides built around the formulas and workflows available in SolveGrid.Percentage increase and decrease
Find percentage change from an original value to a new value.
Read guide →GUIDEProfit margin vs markup
Understand cost-based markup and selling-price margin.
Read guide →GUIDESimple interest formula
Calculate interest from principal, annual rate, and time.
Read guide →GUIDELoan payment formula
Understand periodic payments, total repaid, and total interest.
Read guide →GUIDEHow to plot multiple equations
Compare functions, vertical lines, tables, roots, and intersections.
Read guide →GUIDETI-84 style online graphing workflows
Use independent online workflows for graphs, tables, trace values, and intersections.
Read guide →GUIDECalculate age from a date of birth
Find calendar age in years, months, and days on a chosen date.
Read guide →GUIDEGaussian elimination for linear systems
Use row operations to solve systems with several unknown values.
Read guide →GUIDEMatrix inverse and determinant
Understand when an inverse exists and how determinants guide solutions.
Read guide →GUIDEMatrix methods for linear systems
Compare Gaussian elimination, RREF, inverse, and Cramer’s rule for linear systems.
Read guide →GUIDEStandard deviation formula
Choose sample or population standard deviation and interpret spread.
Read guide →GUIDEEngineering notation and scientific notation
Read powers of ten, SI prefixes, and compact technical values clearly.
Read guide →GUIDEEuler method for differential equations
Use a fixed step and local slope to estimate a first-order initial value problem.
Read guide →GUIDERunge-Kutta RK4 method
Understand four-slope RK4 updates for numerical ordinary differential equations.
Read guide →GUIDESymbolic algebra simplification and differentiation
Understand what a symbolic algebra engine can simplify, differentiate, and compare.
Read guide →GUIDEGraphical method for two-variable linear programming
Build constraints, identify feasible corner points, and test an objective function.
Read guide →GUIDETwo-node nodal analysis
Set up a conductance matrix for a two-node resistor circuit with injected currents.
Read guide →GUIDEHow to choose a statistical test
Separate descriptive statistics, t-tests, correlation, and one-way ANOVA by the question and data type.
Read guide →