Simultaneous equations are two linear equations that can be solved using bar models. By remembering that the same letter will always have the same value we can work out the missing values. To solve ...

An algebraic equation contains one or more letters in it. Each letter in the equation is called a variable. A variable can change in value. We guess at different values for each letter until our ...

Fragmenting your data across many Excel tabs is a common habit that silently kills file performance, introduces hidden errors ...

REDUCE allows you to iterate through your data, building your result step-by-step, in the same way a loop operates in a ...