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During an exam, a quick check can prevent a small mistake from becoming a lost mark. First, confirm which column is the input and which is the output. Write the rule in symbols before calculating. Use one pair of values to test your rule, then apply it to the rest. Keep a tidy column for each step so you can spot an arithmetic slip. Check the zero input when it appears, because it often reveals a constant term. For linear rules, compare equal jumps in x with equal jumps in y. For multiplicative rules, compare ratios instead of differences. Estimate each answer before computing; a result far from your estimate deserves another look. If time remains, substitute your final outputs back into the rule. Circle the final rule and label units if the question includes a real world context. Practice these checks until they feel automatic.
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