1. Calculate $90 \div (3 \times 3) - 3^2$. First, inside the parentheses: $3 \times 3 = 9$. Then division: $90 \div 9 = 10$. Find the square: $3^2 = 9$. Now subtract: $10 - 9 = 1$. Answer: $1$. 2. Calculate $8 \times 4 \div 2 + (15 \div 5) - 4^2$. Calculate multiplication and division from left to right: $8 \times 4 = 32$, then $32 \div 2 = 16$. Calculate inside parentheses: $15 \div 5 = 3$. Calculate the square: $4^2 = 16$. Add and subtract: $16 + 3 - 16 = 3$. Answer: $3$. 3. Calculate $\{(15 - 3 \times 3) - (18 \div 9)\} + 10^2$. Calculate inside first parentheses: $3 \times 3 = 9$, then $15 - 9 = 6$. Calculate inside second parentheses: $18 \div 9 = 2$. Subtract the two: $6 - 2 = 4$. Calculate the square: $10^2 = 100$. Add: $4 + 100 = 104$. Answer: $104$. 4. Calculate $100 - 45 \div 3 \times 3^2 + 56$. Calculate the square: $3^2 = 9$. Calculate division: $45 \div 3 = 15$. Multiply: $15 \times 9 = 135$. Subtract and add: $100 - 135 + 56 = 21$. Answer: $21$. 5. Calculate $6^2 \div 3 \times 4 - 28 + (7 + 3)$. Calculate the square: $6^2 = 36$. Divide: $36 \div 3 = 12$. Multiply: $12 \times 4 = 48$. Calculate inside parentheses: $7 + 3 = 10$. Add and subtract: $48 - 28 + 10 = 30$. Answer: $30$. 6. Calculate $60 \div (5 \times 2) + 4^3$. Calculate inside parentheses: $5 \times 2 = 10$. Divide: $60 \div 10 = 6$. Calculate cube: $4^3 = 64$. Add: $6 + 64 = 70$. Answer: $70$. 7. Calculate $120 \div 12 \times 5 \div 2 - 4$. Calculate division and multiplication from left to right: $120 \div 12 = 10$, $10 \times 5 = 50$, $50 \div 2 = 25$. Subtract: $25 - 4 = 21$. Answer: $21$. 8. Calculate $95 - 24 \div (8 \times 3) + 2^4$. Calculate inside parentheses: $8 \times 3 = 24$. Divide: $24 \div 24 = 1$. Calculate power: $2^4 = 16$. Add and subtract: $95 - 1 + 16 = 110$. Answer: $110$. 9. Calculate $9 \times 12 \div 3 + 5 - 15$. Multiply and divide left to right: $9 \times 12 = 108$, $108 \div 3 = 36$. Add and subtract: $36 + 5 - 15 = 26$. Answer: $26$. 10. Calculate $(36 \div 9 + 14) \div 9 + 12 - 10$. Calculate inside parentheses: $36 \div 9 = 4$, then $4 + 14 = 18$. Divide: $18 \div 9 = 2$. Add and subtract: $2 + 12 - 10 = 4$. Answer: $4$.