Every rule the plots and drills lean on. One board, no guessing.
| Order of operations | Grouping first, then multiply and divide left to right, then add and subtract left to right. |
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| Common denominator first | Unlike fractions get renamed with a shared bottom before you add or subtract. |
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| Multiplying fractions | Straight across: tops together, bottoms together. |
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| Dividing fractions | Flip the second fraction, then multiply. |
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| Mixed to improper | Whole times the bottom, plus the top, over the same bottom. |
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| Decimal point trades | Multiplying by 10 moves the point one place right. Dividing moves it one place left. |
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| Percent | Percent means per hundred. |
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| Percent of a number | Trade the percent for a decimal, then multiply. |
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| Average | The sum of the values divided by how many there are. |
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| Prime and composite | A prime has exactly two factors: one and itself. A composite has more. |
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| GCF and LCM | The greatest factor two numbers share; the least multiple two numbers share. |
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| Triangle area | Half of base · height. |
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| Box volume | Length · width · height. |
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| Rounding | Look one place further: 5 or more rounds up. |
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