Glossary · Phase 0 · Tools
Order of operations
The agreed order for working out a calculation: brackets, then powers, then multiplying and dividing, then adding and subtracting.
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Each line uses the one before it, so the order is forced: you can't take 10% off a subtotal that doesn't exist yet.
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Formulas: order, substitution and rearranging · Work a calculation in the right order, fill in a formula, and turn it around to find what's missing. About 20 minutes.
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