Final answer:
Grace has practiced 4 times the amount she needs to practice today.
Step-by-step explanation:
To find out what fraction of her time Grace has practiced today, we need to calculate the fraction of time she has practiced out of the total time she needs to practice. Grace needs to practice for 1/6 hours a day and she has practiced for 8/12 hours today. To find the fraction, we divide the time she has practiced (8/12) by the total time she needs to practice (1/6). Dividing fractions involves multiplying the first fraction by the reciprocal of the second fraction. So, we can multiply 8/12 by 6/1, which gives us (8/12) * (6/1) = 48/12. Simplifying this fraction, we get 4/1. Therefore, Grace has practiced 4/1 or 4 times the amount she needs to practice today.