A fraction \(\frac{a}{b}\) means a ÷ b. Convert to a decimal.<br><br>&bull; Multiply numerator and denominator by 25: \(\frac{21 \times 25}{40 \times 25} = \frac{525}{1000}\)<br>&bull; \(\frac{525}{1000} = 0.525\)<br><br>Final Answer: 0.525