This math topic focuses on identifying the ones digit in the product of multiplication problems. It provides practice in understanding how different digits interact during multiplication and how to deduce the last digit of the result. The problems presented require learners to figure out which digit will fill in a placeholder indicated by a question mark, fine-tuning their skills in basic multiplication and pattern recognition within numerical operations. It is introduced as a fundamental element of a broader unit on digits and divisibility.
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Each letter is a digit (0-9). What digit will be in the box with a question mark?