1. The problem is to learn easy tricks for basic arithmetic operations: addition, subtraction, multiplication, and division. 2. For addition, a useful trick is to group numbers to make tens or hundreds. For example, $27 + 43$ can be thought of as $20 + 40 = 60$ plus $7 + 3 = 10$, so $27 + 43 = 70$. 3. For subtraction, use the idea of adding up from the smaller number to the bigger number. For example, to find $52 - 29$, think: $29 + 1 = 30$, $30 + 20 = 50$, $50 + 2 = 52$, so $52 - 29 = 23$. 4. For multiplication, use distributive property: break numbers into parts. For example, $12 \times 15 = (10 + 2) \times 15 = 10 \times 15 + 2 \times 15 = 150 + 30 = 180$. 5. For division, estimate how many times the divisor fits into the dividend by rounding. For example, $98 \div 7$ is close to $100 \div 7 \approx 14$, then adjust to get the exact answer $14$. 6. These tricks help simplify calculations by breaking them into easier steps and using rounding or grouping. Final answer: Use grouping for addition, counting up for subtraction, distributive property for multiplication, and estimation for division to solve sums easily.