A division sentence a ÷ b can be written as the fraction \(\frac{a}{b}\). Then convert the improper fraction to a mixed number.<br><br>• 21 ÷ 9 = \(\frac{21}{9}\)<br>• Simplify: HCF of 21 and 9 is 3.<br>• \(\frac{21}{9}\) = \(\frac{21 \div 3}{9 \div 3}\) = \(\frac{7}{3}\)<br>• Convert to mixed number: 7 ÷ 3 = 2 remainder 1<br>• \(\frac{7}{3}\) = 2\(\frac{1}{3}\)<br>• A = 1, B = 3<br><br>Final Answer: A = 1, B = 3