WRITE 20 MATH QUESTIONS AND ANSWERS FOR GRADE 8
1. What is the value of x in the equation 2x + 5 = 17?
Answer: x = 6
2. Simplify the expression 3x - 5y + 2x + y, when x = 4 and y = 7.
Answer: 9x - 4y = 9(4) - 4(7) = 36 - 28 = 8
3. Solve the equation 4(x + 3) = 32.
Answer: x = 5
4. Evaluate the expression 5(3 + 2)².
Answer: 125
5. Find the area of a rectangle with length 6 cm and width 4 cm.
Answer: 24 cm²
6. What is the slope-intercept form of the equation of a line with slope 2 and y-intercept 3?
Answer: y = 2x + 3
7. Solve the equation 3(2x - 5) = 21.
Answer: x = 8
8. Simplify the expression 4² - 6 + 2(3x + 1).
Answer: 16 + 2(3x + 1) = 16 + 6x + 2 = 6x + 18
9. Find the volume of a cube with side length 5 cm.
Answer: 125 cm³
10. Solve the equation 2(x - 3) + 4 = 14.
Answer: x = 10
11. Simplify the expression 7x² + 3x - 4x² + 2x - 5.
Answer: 3x² + 5x - 5
12. Find the perimeter of a rectangle with length 8 cm and width 5 cm.
Answer: 26 cm
13. Solve the equation -2(x + 6) = 10.
Answer: x = -8
14. Simplify the expression 2² + 3(4 - 2).
Answer: 10
15. Find the area of a triangle with base 6 cm and height 3 cm.
Answer: 9 cm²
16. Solve the equation 5(x - 2) - 3(x + 1) = 7.
Answer: x = 6
17. Simplify the expression 2(3x - 4) + 5(2x + 1).
Answer: 19x + 2
18. Find the circumference of a circle with radius 5 cm. (Use π ≈ 3.14)
Answer: 31.4 cm
19. Solve the equation 3(x - 4) = 18.
Answer: x = 10
20. Simplify the expression 2(5x - 3)² - 4x + 5.
Answer: 50x² - 60x + 19
Sure! Here are 20 math questions and their answers for Grade 8:
1. What is the value of 5 + 7?
Answer: 12
2. Solve the equation: 3x + 5 = 17.
Answer: x = 4
3. Calculate the area of a rectangle with length 9 cm and width 7 cm.
Answer: 63 cm²
4. Simplify the expression: 4x + 2y + 3x - y.
Answer: 7x + y
5. Find the average of 15, 20, and 25.
Answer: 20
6. Solve for x if 4x + 6 = 22.
Answer: x = 4
7. Calculate the circumference of a circle with a diameter of 10 cm.
Answer: 31.4 cm (rounded to one decimal place)
8. Expand and simplify: (3x + 1)(2x - 4).
Answer: 6x² - 10x - 4
9. Solve the equation: 2(3x - 4) = 18.
Answer: x = 5
10. Find the volume of a cube with side length 4 cm.
Answer: 64 cm³
11. Simplify the expression: (2x + 3)².
Answer: 4x² + 12x + 9
12. Calculate the area of a triangle with base 8 cm and height 6 cm.
Answer: 24 cm²
13. Solve for x: 2(x + 3) - 5 = 7x - 6.
Answer: x = 2
14. Simplify: 3/4 + 2/5.
Answer: 23/20
15. Find the missing angle in the triangle if the other two angles are 50° and 70°.
Answer: 60°
16. Solve the equation: 2/3x + 4/5 = 10.
Answer: x = 15
17. Calculate the perimeter of a square with side length 12 cm.
Answer: 48 cm
18. Simplify: (6x² - 4x - 2) ÷ 2.
Answer: 3x² - 2x - 1
19. Solve for y: 3x - 4y = 12.
Answer: y = (3x - 12)/4
20. Calculate the surface area of a rectangular prism with dimensions 5 cm, 3 cm, and 10 cm.
Answer: 170 cm²