Auntie Lim writes a number pattern on the classroom calendar to help her Primary 2 class practise their times tables. 4, 8, 12, 16, ___ What is the missing number?
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Worked Solution
Step 1: Find the difference between consecutive terms.
8 - 4 = 4
12 - 8 = 4
16 - 12 = 4
The pattern increases by 4 each time (skip-counting by 4).
Step 2: Add the common difference to the last known term.
16 + 4 = 20
Answer: The missing number is 20.
Correct answer: 20
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