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
721–740 of 750 matching chapters · Page 37 of 38
Clear filtersGrade 8 · Chapter 721
Connect slope and a linear rule · practice 86
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 722
Locate simultaneous solutions · practice 86
Solve the simultaneous equations y = -2.5x and y = -0.5x + (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 723
Follow decimal place-value scaling · practice 81
Write 4.5 × 10^(-6) 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 724
Separate trend from causal claims · practice 83
For inputs [1, 2, 3, 4, 5] and corresponding outputs [5.25, 2.5, 1, -0.5, -3.25], 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 725
Accumulate circular cross-sections · practice 84
Find the volume of a cylinder with radius 5.5 and height 1.5. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 726
Bracket a principal square root · practice 86
Enclose √31 after 6 bisections starting from [0, 31]. 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 727
Distinguish length and area multipliers · practice 86
Dilate a rectangle with sides 1.5 and 4.75 by length factor 1.5. 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 728
Connect slope and a linear rule · practice 87
For the line y = 3x + (0), 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 729
Locate simultaneous solutions · practice 87
Solve the simultaneous equations y = 1x and y = 2.5x + (-1). 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 730
Follow decimal place-value scaling · practice 82
Write 5 × 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 731
Separate trend from causal claims · practice 84
For inputs [1, 2, 3, 4, 5] and corresponding outputs [11, 11, 16, 21, 21], 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 732
Accumulate circular cross-sections · practice 85
Find the volume of a cylinder with radius 3.5 and height 7.5. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 733
Bracket a principal square root · practice 87
Enclose √7 after 2 bisections starting from [0, 7]. 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 734
Distinguish length and area multipliers · practice 87
Dilate a rectangle with sides 3.5 and 3.5 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 735
Connect slope and a linear rule · practice 88
For the line y = 1.5x + (-3), 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 736
Locate simultaneous solutions · practice 88
Solve the simultaneous equations y = -2x 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 737
Separate trend from causal claims · practice 85
For inputs [1, 2, 3, 4, 5] and corresponding outputs [11.25, 7.5, 12.5, 17.5, 13.75], 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 738
Accumulate circular cross-sections · practice 86
Find the volume of a cylinder with radius 1.5 and height 4. Follow the calculation, then test the quantities in the animated example.
Question · Worked solution · Animated example
Open practice chapterGrade 8 · Chapter 739
Bracket a principal square root · practice 88
Enclose √102 after 8 bisections starting from [0, 102]. 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 740
Distinguish length and area multipliers · practice 88
Dilate a rectangle with sides 4.5 and 5.5 by length factor 3. 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 chapter