Solve the arithmetic problems shown in the image.

Here are the solutions and explanations for each problem presented in the image: 1. **9^2 × 4/3 = 108** - First, calculate 9^2 = 81. - Then, multiply 81 by 4/3: (81 × 4)/3 = 324/3 = 108. 2. **12 × 27 = 324** - Multiply 12 by 27 directly to get 324. 3. **(108 + 324) ÷ 9 = 48** - Add 108 and 324: 108 + 324 = 432. - Then, divide 432 by 9: 432 ÷ 9 = 48. 4. **21 + 13 + 44 + 19 + 31 = 128** - Add the numbers sequentially: 21 + 13 = 34, 34 + 44 = 78, 78 + 19 = 97, 97 + 31 = 128. 5. **(7/2 + 1/2) ÷ (1/3) = 12** - Add the fractions in the numerator: 7/2 + 1/2 = 8/2 = 4. - Divide 4 by 1/3: 4 ÷ 1/3 = 4 × 3/1 = 12. 6. **√324 ÷ 2 = 9** - Find the square root of 324: √324 = 18. - Divide 18 by 2: 18 ÷ 2 = 9.