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To multiply 6 times 198 mentally, you can break down 198 into smaller, more manageable parts. For instance, you can express it as ( 198 = 200 - 2 ). Then, rewrite the expression as ( 6 \times 198 = 6 \times (200 - 2) ), which simplifies to ( 6 \times 200 - 6 \times 2 ). This gives you ( 1200 - 12 = 1188 ), making it easier to calculate mentally.

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