Used a difference of 300 instead of 200: 4 200 - 300 = 3 900. Check by subtracting consecutive terms: 4 800 - 4 600 = 200, confirming the step is 200 not 300.
PRIMARY 3 · MATHEMATICS
Whole Numbers
Top 5 mistakes
Ranked by how often they appear across 37 MOE-aligned practice questions in our archive.
Used a difference of 250 instead of 200: 4 200 - 250 = 3 950. The correct step is 200 as shown by 4 600 - 4 400 = 200.
Used a difference of 100 instead of 200: 4 200 - 100 = 4 100. The pattern decreases by 200 each step, not 100.
Read the digit itself, not its place value. In 7091, the 7 is in the THOUSANDS place — its value is 7 × 1000 = 7000.
Treated the 7 as if it were in the tens place. In 7091, the 7 is on the far left — the thousands place.
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