Grade 8 · Pre-Algebra
Ratios, slope, integers, and the Pythagorean theorem. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: slope
Rise over run.
Answer: y-intercept
The line crosses the y-axis at (0, b).
Answer: (y₂ − y₁) / (x₂ − x₁)
Vertical change over horizontal change.
Answer: horizontal
y does not change.
Answer: undefined slope
You would divide by zero.
Answer: 2
(6 − 2) / (3 − 1) = 4/2 = 2.
Answer: negative, so the line falls left to right
Negative m means the line decreases.
Answer: the same slope
Perpendicular slopes are opposite reciprocals.
Answer: a² + b² = c²
Only for right triangles; c is the hypotenuse.
Answer: the side opposite the right angle
It is the longest side.
Answer: 5
9 + 16 = 25, √25 = 5.
Answer: 13
25 + 144 = 169, √169 = 13.
Answer: scaled 3-4-5 right triangle
Multiply 3-4-5 by 2.
Answer: 8
36 + b² = 100 → b² = 64.
Answer: the distance between two points on a grid
Think of the legs as Δx and Δy.
Answer: a triangle with no right angle
All angles must include 90°.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
