Beth used her calculator to multiply 19 by 0.2, and her answer was 3.8. What mental check can Beth use to test whether her answer makes sense? Multiplying by 0.2 is the same as multiplying by 5, so her answer should be close to 19 times 5. Multiplying by 0.2 is the same as dividing by 5, so her answer should be close to 19 divided by 5. Multiplying by 0.2 is the same as multiplying by 2, so her answer should be close to 19 times 2. Multiplying by 0.2 is the same as dividing by 2, so her answer should be close to 19 divided by 2.