cross-multiplication
Diagonal fraction arithmetic
Cross-multiplication is a method for solving equations involving two fractions set equal to each other.
You multiply the numerator of each fraction by the denominator of the other, then set those products equal: if a/b = c/d, then ad = bc.
The technique also compares fractions—whichever cross-product is larger indicates the larger fraction.
Comparative relation of parts
- equationMathematical equality assertion
- fractionsParts expressed numerically
- diagonalSlanting line or path
- solveFind the answer
numerator · denominator · equivalent · cancel · simplify · isolate · variable · product
Scaled to match another
- scaleMeasure of relative size
- equivalentSame in value or function
- relationshipConnection between entities
- comparativeInvolving measured contrast
ratio · fraction · inverse · direct · constant · rate · comparison · conversion
Arranged in straight succession
- variablesChangeable elements in equations
- coefficientsNumerical multipliers in expressions
- solveFind the answer
- unknownNot yet discovered
terms · expression · substitution · elimination · systems · simultaneous · equations · inequality
proportion
Comparative relation of parts
- equationMathematical equality assertion
- fractionsParts expressed numerically
- diagonalSlanting line or path
solve · numerator · denominator · equivalent · cancel · simplify · isolate · variable · product · equality
proportional
Scaled to match another
- scaleMeasure of relative size
- equivalentSame in value or function
- relationshipConnection between entities
comparative · ratio · fraction · inverse · direct · constant · rate · comparison · conversion · unit
linear
Arranged in straight succession
- variablesChangeable elements in equations
- coefficientsNumerical multipliers in expressions
- solveFind the answer
unknown · terms · expression · substitution · elimination · systems · simultaneous · equations · inequality · rational
- math operationsaddition, adding, subtraction, subtracting, division
cross-multiplicationmental math
Numerical computation done internally
cross, multiply, multiplication, crossed, crossing, crosses, crosswise, multiplied, multiplies