A number pattern is shown on a worksheet: 5, 10, 20, 40, ___, 160. What is the missing number?
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Worked Solution
Step 1: Find the rule. Look at how each number changes.
5 → 10: multiply by 2
10 → 20: multiply by 2
20 → 40: multiply by 2
Step 2: The rule is ×2 each time.
Step 3: Apply the rule: 40 × 2 = 80.
Step 4: Check the next step: 80 × 2 = 160 ✓
Answer: 80
Correct answer: 80
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