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a) To estimate 416 * 1.9, we can round 416 to 400 and 1.9 to 2. The calculation then becomes 400 * 2 = 800. Millie's answer of 7904 is not sensible as it is much larger than the estimated answer of 800.
b) Using a calculator, the actual answer to 416 * 1.9 is 790.4. Millie may have accidentally added an extra zero to her answer, resulting in 7904 instead of 790.4.