Grade 5 will plant 1/3 of the whole school garden. So far, they have planted ¼ of the whole school garden. What fraction of the school garden still needs to be planted by grade 5?

(1/3) - (1/4)

(4/12) - (3/12) = 1/12

To find the fraction of the school garden that still needs to be planted by grade 5, we need to subtract the fraction of the garden that they have already planted from the fraction that they are supposed to plant in total.

Grade 5 is supposed to plant 1/3 of the whole school garden, and so far they have planted 1/4 of the whole garden.

To subtract fractions, the denominators (the bottom numbers) must be the same. In this case, we need to convert the fractions so that they both have the same denominator.

The least common denominator (LCD) for 3 and 4 is 12. So, we will convert both fractions to have denominators of 12.

To convert 1/3 to a fraction with a denominator of 12, we multiply the numerator (the top number) and denominator by 4:
1/3 = 4/12.

To convert 1/4 to a fraction with a denominator of 12, we multiply the numerator and denominator by 3:
1/4 = 3/12.

Now that both fractions have the same denominator, we can subtract them:
4/12 - 3/12 = 1/12.

Therefore, Grade 5 still needs to plant 1/12 of the school garden.