Math With Amar · Guided practice
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Each chapter gives you a distinct mathematical scenario: one question to attempt, a hint, a worked solution, and an animated example you can control.
10,000 questions · 10,000 animated scenarios · 14 study levels
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Grade labels are starting points; school sequences vary. Advanced chapters assume the prerequisites listed on their pages.
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Grade 8 practice chapters
361–380 of 750 matching chapters · Page 19 of 38
Clear filtersGrade 8 · Chapter 361
Follow decimal place-value scaling · practice 37
Write 7 × 10^(2) as an ordinary decimal number. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 362
Separate trend from causal claims · practice 39
For inputs [1, 2, 3, 4, 5] and corresponding outputs [9.75, 9.5, 13, 16.5, 16.25], find the least-squares slope, mean output, and sum of squared residuals. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 363
Accumulate circular cross-sections · practice 38
Find the volume of a cylinder with radius 7.5 and height 7. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 364
Bracket a principal square root · practice 40
Enclose √64 after 12 bisections starting from [0, 64]. Report bounds rounded outward to five decimal places and the exact interval width. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 365
Distinguish length and area multipliers · practice 40
Dilate a rectangle with sides 2.5 and 3.75 by length factor 2.5. Find the new side lengths and area. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 366
Connect slope and a linear rule · practice 41
For the line y = -4x + (-4), find y when x = 3 and identify the slope and vertical intercept. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 367
Locate simultaneous solutions · practice 41
Solve the simultaneous equations y = 0.5x and y = -2.5x + (-8). Classify the number of solutions. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 368
Translate every coordinate equally · practice 40
Translate the point (1, 1) by the vector (-4, 6). Find the image and the movement length. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 369
Recover a right-triangle distance · practice 37
A right triangle has perpendicular legs 1 and 9. Find its hypotenuse. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 370
Follow decimal place-value scaling · practice 38
Write 7.5 × 10^(-3) as an ordinary decimal number. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 371
Separate trend from causal claims · practice 40
For inputs [1, 2, 3, 4, 5] and corresponding outputs [10, 6, 9.5, 13, 9], find the least-squares slope, mean output, and sum of squared residuals. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 372
Accumulate circular cross-sections · practice 39
Find the volume of a cylinder with radius 5.5 and height 3.5. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 373
Bracket a principal square root · practice 41
Enclose √40 after 8 bisections starting from [0, 40]. Report bounds rounded outward to five decimal places and the exact interval width. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 374
Distinguish length and area multipliers · practice 41
Dilate a rectangle with sides 3.5 and 5.75 by length factor 2. Find the new side lengths and area. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 375
Connect slope and a linear rule · practice 42
For the line y = 4x + (8), find y when x = 3 and identify the slope and vertical intercept. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 376
Locate simultaneous solutions · practice 42
Solve the simultaneous equations y = -2x and y = 1x + (6). Classify the number of solutions. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 377
Translate every coordinate equally · practice 41
Translate the point (1, 1) by the vector (-3, 1). Find the image and the movement length. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 378
Recover a right-triangle distance · practice 38
A right triangle has perpendicular legs 11 and 11. Find its hypotenuse. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 379
Follow decimal place-value scaling · practice 39
Write 8 × 10^(5) as an ordinary decimal number. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 380
Separate trend from causal claims · practice 41
For inputs [1, 2, 3, 4, 5] and corresponding outputs [-1.5, -10, -6, -2, -10.5], find the least-squares slope, mean output, and sum of squared residuals. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapter