To find out how many times Joslani needs to fill his 1/8 teaspoon measuring tool to get 5/8 teaspoon of coloring, we can follow these steps:
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Divide the total amount of coloring needed (5/8 teaspoon) by the amount he can measure (1/8 teaspoon):
\[ \frac{5/8}{1/8} \]
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Dividing by a fraction is the same as multiplying by its reciprocal:
\[ 5/8 \times 8/1 = 5 \]
So, Joslani will need to fill his 1/8 teaspoon measuring tool 5 times to have enough coloring to follow the recipe.