Answer:

2 1/3 + 3 3/4

2 1/3 = 7/3

3 3/4 = 15/4

7/3 + 15/4

28/12 + 45/12 = 73/12

8 - 73/12

8 = 96/12

96/12 - 73/12 = 23/12

23/12 (divided by 1/1) = 23/12

Therefore, Nina has 23/12 pieces of cartolina remaining, which is approximately 1 and 7/12 pieces.

Step-by-step explanation:

To find how many pieces of cartolina Nina used in total, we need to add the amount used for the first project and the amount used for the second project:

2 1/3 + 3 3/4

First, we need to convert the mixed numbers to improper fractions:

2 1/3 = 7/3

3 3/4 = 15/4

Now we can add:

7/3 + 15/4

To add these fractions, we need to find a common denominator, which is 12. We can rewrite 7/3 as 28/12 and 15/4 as 45/12:

28/12 + 45/12 = 73/12

So Nina used a total of 73/12 pieces of cartolina.

To find out how many pieces of cartolina she has left, we need to subtract the amount used from the total amount she bought:

8 - 73/12

We can convert 8 to a fraction with a common denominator of 12:

8 = 96/12

Now we can subtract:

96/12 - 73/12 = 23/12

So Nina has 23/12 pieces of cartolina remaining. We can simplify this fraction by dividing both the numerator and denominator by the greatest common factor of 23 and 12, which is 1:

23/12 (divided by 1/1) = 23/12

Therefore, Nina has 23/12 pieces of cartolina remaining, which is approximately 1 and 7/12 pieces.

Additional:

Nina used a total of 73/12 pieces of cartolina (2 1/3 + 3 3/4).

Nina has 23/12 pieces of cartolina (approximately 1 and 7/12 pieces) remaining.

Solution:

Nina used 73/12 pieces of cartolina and has 23/12 pieces of cartolina remaining.

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