Common Mistakes

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Trap: Forgetting to carry or borrow digits in multi-step arithmetic.

Correct: Write each digit in aligned columns and double-check every step.

Tip: Take one operation at a time and verify the result immediately.

Trap: Adding or subtracting before multiplying or dividing in mixed expressions.

Correct: Always follow PEMDAS/BODMAS rules.

Tip: Underline the operation you will do first before calculating.

📖

Trap: Missing words such as "at least," "at most," "not," or "exactly."

Correct: Circle or underline limiting words before solving.

Tip: Read the question twice and mark every condition.

Trap: Using cm, m, and km in the same calculation without converting.

Correct: Convert all quantities to the same unit first.

Tip: Write the conversion factor next to each quantity.

💡

Trap: Counting the same object twice or leaving out valid cases.

Correct: Use a tree diagram, table, or systematic list.

Tip: Arrange cases in order and cross-check the total.

Trap: Stopping as soon as an answer is found.

Correct: Plug the answer back into the question to verify.

Tip: Reserve the last minute to review at least three problems.