Math With Amar · Guided practice
10,000 ways to practice.
One idea at a time.
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
81–100 of 750 matching chapters · Page 5 of 38
Clear filtersGrade 8 · Chapter 81
Accumulate circular cross-sections · practice 8
Find the volume of a cylinder with radius 2 and height 6. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 82
Bracket a principal square root · practice 9
Enclose √94 after 10 bisections starting from [0, 94]. 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 83
Distinguish length and area multipliers · practice 9
Dilate a rectangle with sides 3 and 5.5 by length factor 0.75. 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 84
Connect slope and a linear rule · practice 10
For the line y = 4x + (10), 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 85
Locate simultaneous solutions · practice 10
Solve the simultaneous equations y = 1x and y = -0.5x + (-7). 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 86
Translate every coordinate equally · practice 10
Translate the point (1, 1) by the vector (-1, -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 87
Recover a right-triangle distance · practice 8
A right triangle has perpendicular legs 1 and 12. Find its hypotenuse. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 88
Explain zero and negative powers · practice 8
Evaluate 2 raised to the integer power 1. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 89
Follow decimal place-value scaling · practice 9
Write 9 × 10^(4) 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 90
Separate trend from causal claims · practice 9
For inputs [1, 2, 3, 4, 5] and corresponding outputs [10, 10, 12.5, 15, 15], 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 91
Accumulate circular cross-sections · practice 9
Find the volume of a cylinder with radius 7.5 and height 2. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 92
Bracket a principal square root · practice 10
Enclose √70 after 6 bisections starting from [0, 70]. 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 93
Distinguish length and area multipliers · practice 10
Dilate a rectangle with sides 1.5 and 3.25 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 94
Connect slope and a linear rule · practice 11
For the line y = 3x + (-6), 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 95
Locate simultaneous solutions · practice 11
Solve the simultaneous equations y = -1.5x and y = 3x + (7). 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 96
Translate every coordinate equally · practice 11
Translate the point (1, 1) by the vector (0, -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 97
Follow decimal place-value scaling · practice 10
Write 9.5 × 10^(-1) 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 98
Separate trend from causal claims · practice 10
For inputs [1, 2, 3, 4, 5] and corresponding outputs [-1.5, -6, -3, 0, -4.5], 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 chapterGrade 8 · Chapter 99
Accumulate circular cross-sections · practice 10
Find the volume of a cylinder with radius 5.5 and height 8. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 100
Bracket a principal square root · practice 11
Enclose √46 after 2 bisections starting from [0, 46]. 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 chapter