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==Key Stage 3==
===Meaning===
To '''substitute''' is to replace part of a formula or [[equation ]] with a number or another formula.
===About Substituting===
: When answering questions that involve an [[equation ]] the numbers from the question are '''substituted''' into the [[equation]].
==Key Stage 4==
===Meaning===
To '''substitute''' is to replace part of a formula or [[equation ]] with a number or another formula.
===About Substituting===
: When answering questions that involve an [[equation ]] the numbers from the question are '''substituted''' into the [[equation]].