Algebra

Arithmetic, fractions, powers, roots, equations and systems.

• Do basic arithmeticAdd, subtract, multiply and divide, and see how each calculator family shows the answer.
• Use brackets to control the orderGroup part of a calculation with brackets so it is worked out first.
• Enter and calculate with negative numbersUse the negative-sign key (not the subtract key) so a number really becomes negative.
• Work with fractionsAdd, subtract, multiply and divide fractions and get an exact fraction back.
• Convert between fractions and decimalsTurn 0.75 into 3/4, or 3/8 into 0.375.
• Powers and exponentsSquare a number or raise it to any power such as 2 to the 10th.
• Find a square rootGet the square root of a number, exactly or as a decimal.
• Cube roots and other rootsFind any root of a number, such as the cube root of 27.
• Find a percentage of a numberWork out 15% of 200 with the percent key or by dividing by 100.
• Reuse the last answerCarry the previous result into your next calculation without retyping it.
• Store a number in a variableSave a value under a letter so you can use it again in later calculations.
• Evaluate an expression for a value of xFind the value of 3x² − 2x + 1 when x is 4.
• Solve a linear equationFind x in an equation like 3x + 5 = 20.
• Solve a quadratic equationFind the roots of x² − 5x + 6 = 0 with a polynomial solver or the quadratic formula.
• Solve a system of two equationsFind x and y when 2x + y = 5 and x − y = 1.
• Solve a system of three equationsFind x, y and z for three linked equations.
• Absolute valueFind how far a number is from zero, ignoring its sign.
• Round answers to a set number of decimalsChange the display so every answer shows, say, 2 decimal places.
• Greatest common divisor and least common multipleFind the largest number that divides two numbers (GCD) and the smallest number both divide (LCM).
• Break a number into prime factorsWrite 84 as a product of primes: 2 × 2 × 3 × 7.