38 tài liệu đã gắn thẻ được gắn thẻ "Grade 8"

Learn why angles in a triangle always add up to 180°, how to find missing angles, and the types of triangles by their angles. Grade 7–8 geometry with examples.

Learn the area of a circle formula (A = pi r squared) and circumference formula (C = 2 pi r) with clear worked examples and practice problems.

Learn how to calculate the area and perimeter of rectangles, triangles, circles, and more with clear formulas, worked examples, and practice problems.

Learn how to find the area of a triangle using the base-times-height formula. Includes worked examples, Heron's formula, and practice problems.

Learn how to combine like terms in algebra with clear rules, step-by-step worked examples, and practice problems for grade 7-8 students.

Learn the difference between complementary angles (sum to 90°) and supplementary angles (sum to 180°). Includes vertical angles, linear pairs, and practice.

Learn the distance formula with clear derivation, 5 worked examples, and practice problems. Find the distance between any two points on a coordinate plane.

Master every exponent rule — product, quotient, power, zero, and negative — with clear formulas, step-by-step examples, and practice problems for grades 7-8.

Learn exponents and powers with clear rules, KaTeX formulas, worked examples, and practice problems for grade 7-8 students.

Learn the percentage increase and decrease formula with step-by-step examples. Covers markups, discounts, population change, and reverse percentage problems.

Learn how to calculate percentage of a number step by step. Master the percentage formula with worked examples and practice problems for grades 7-8.

Learn the area of a trapezoid formula with clear explanations, step-by-step examples, and practice problems. Master the parallel-bases method.

Learn the slope formula, how to calculate rise over run, and identify positive, negative, zero, and undefined slopes. Grade 8–9 algebra with step-by-step examples.

Learn how to graph linear equations using slope-intercept form y = mx + b and by finding x and y intercepts. Step-by-step examples for Grade 8–9 students.

Learn how to solve equations with fractions by clearing denominators using the LCD. Step-by-step examples and practice for grades 7-8.

Learn how to solve one-step and two-step inequalities, graph solutions on a number line, and avoid the sign-flip mistake. Grade 7–8 algebra with examples.

Learn how to translate, solve, and graph inequalities from word problems with step-by-step solutions and practice for grade 7-8 students.

Learn how to solve linear equations step by step with clear theory, worked examples, common mistakes, and practice problems for grades 7-9.

Understand negative exponents, learn the reciprocal rule, and practice simplifying expressions with negative powers. Step-by-step examples for grades 8-9.

Learn about parallel and perpendicular lines, the angle pairs they create with a transversal, and how to identify them using slope. Grade 7-8 geometry guide.

Practice percentage word problems with step-by-step solutions. Covers discounts, taxes, tips, test scores, and real-life scenarios for grades 7-8.

Learn how to calculate percentages, convert between fractions, decimals, and percents, and solve percentage word problems with step-by-step examples.

Learn how to calculate probability with the basic formula, worked examples using dice, coins, and cards, common mistakes, and practice problems for grades 7-8.

Learn the Pythagorean theorem with clear explanations, a visual proof, worked examples, and practice problems for grades 8-9.

Practice the Pythagorean theorem with 5 worked examples and answers. Find missing sides, verify right triangles, and solve real-world problems step by step.

Solve real-world Pythagorean theorem word problems step by step. Ladders, navigation, construction, and sports — with full worked solutions for grades 8-9.

Learn what Pythagorean triples are, see a list of common triples, and discover how to generate new ones using a simple formula. Worked examples and practice for grades 8-9.

Learn how to draw and interpret scatter plots, identify positive and negative correlation, draw a line of best fit, and make predictions from data.

Learn scientific notation step by step — how to convert numbers, multiply, divide, and add in scientific notation. Worked examples and practice for grades 8-9.

Learn the difference between similar and congruent triangles, the SSS, SAS, ASA, and AA similarity tests, and how to find missing sides using proportions.

Master two-step equations with clear explanations, worked examples, and practice problems. Learn the undo strategy for grades 7-8 algebra.

Learn how to find square roots and cube roots, simplify radicals, and solve root problems step by step. Clear examples and practice for grades 7-8.

Learn statistics basics including mean, median, mode, range, and data analysis with clear formulas, worked examples, and practice problems for grades 6-8.

Learn how to calculate the surface area of prisms, cylinders, pyramids, cones, and spheres with clear formulas, worked examples, and practice.

Learn how to solve systems of two linear equations using substitution and elimination, with step-by-step examples, word problems, and practice for grade 8-9.

Learn how to read and create two-way frequency tables, calculate joint and marginal frequencies, and find conditional relative frequencies with examples.

Learn the volume formulas for prisms, cylinders, pyramids, cones, and spheres with worked examples. Step-by-step guide for Grade 8–9 geometry students.

Learn how to translate word problems into equations and solve them step by step. Real-world examples and practice for grades 7-8 algebra.