What is it
Iteration is a method for finding approximate solutions to equations that can't be solved exactly, by repeatedly substituting a value into a rearranged formula (xₙ₊₁ = ...) until the answer converges.
Why it matters
Iteration introduces the idea of numerical methods — solving problems through repeated approximation rather than an exact formula — a concept that becomes central in university-level mathematics and computer science.
Exam tip
Keep at least 4-5 decimal places at every step of an iteration and don't round early — early rounding is the most common reason a student's iteration fails to converge to the expected answer.
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