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

Choose a starting point
Practice at your level.
Grade labels are starting points; school sequences vary. Advanced chapters assume the prerequisites listed on their pages.
Attempt · Explain · Animate
Grade 4 practice chapters
21–40 of 750 matching chapters · Page 2 of 38
Clear filtersGrade 4 · Chapter 21
Combine metres with extra centimetres: whole metres: 3; extra centimetres: 59
A measurement for a classroom activity consists of 3 whole metres and 59 extra centimetres. Find the full measurement in centimetres, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 22
Reflect a design across a vertical line: distance of marked vertex from mirror: 2
A triangular design for a classroom activity places its marked vertex 2 units left of a vertical mirror line and uses height 3. Find the reflected marked vertex's horizontal coordinate, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 23
Multiply every expanded place-value part: three-digit amount: 974; equal copies: 5
At a classroom activity, 5 identical supply sets each contain 974 counters. Find the number of objects in all the original sets, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 24
Test divisibility by making full groups: whole number to test: 12; candidate factor: 2
At a classroom activity, 12 counters are packed in groups of exactly 2. Find the number of complete groups and the remainder, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 25
Add eighths and regroup whole units: first count of eighths: 5; second count of eighths: 7
A measured supply at a classroom activity combines 5/8 of a unit with another 7/8 of the same unit. Find the exact sum in a common fractional unit, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 26
Repeat a fractional amount: quarters in each portion: 2; number of portions: 4
A plan for a classroom activity calls for 4 portions, each 2/4 of a unit. Find the amount needed for the original portions, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 27
Keep cents aligned when adding money: first amount: 855 cents; second amount: 35 cents
An illustrated budget for a classroom activity has costs of $8.55 and $0.35. Find the original combined cost in cents and dollars, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 28
Combine metres with extra centimetres: whole metres: 2; extra centimetres: 21
A measurement for a classroom activity consists of 2 whole metres and 21 extra centimetres. Find the full measurement in centimetres, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 29
Reflect a design across a vertical line: distance of marked vertex from mirror: 1
A triangular design for a classroom activity places its marked vertex 1 units left of a vertical mirror line and uses height 3. Find the reflected marked vertex's horizontal coordinate, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 30
Scale one digit through powers of ten: digit: 5; places left of ones: 5
A place-value demonstration for a classroom activity moves the digit 5 through 5 places to the left of ones. Find the digit's value after the stated moves, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 31
Multiply every expanded place-value part: three-digit amount: 925; equal copies: 2
At a classroom activity, 2 identical supply sets each contain 925 counters. Find the number of objects in all the original sets, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 32
Test divisibility by making full groups: whole number to test: 91; candidate factor: 8
At a classroom activity, 91 counters are packed in groups of exactly 8. Find the number of complete groups and the remainder, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 33
Add eighths and regroup whole units: first count of eighths: 1; second count of eighths: 4
A measured supply at a classroom activity combines 1/8 of a unit with another 4/8 of the same unit. Find the exact sum in a common fractional unit, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 34
Keep cents aligned when adding money: first amount: 330 cents; second amount: 350 cents
An illustrated budget for a classroom activity has costs of $3.30 and $3.50. Find the original combined cost in cents and dollars, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 35
Combine metres with extra centimetres: whole metres: 1; extra centimetres: 83
A measurement for a classroom activity consists of 1 whole metres and 83 extra centimetres. Find the full measurement in centimetres, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 36
Scale one digit through powers of ten: digit: 6; places left of ones: 3
A place-value demonstration for a classroom activity moves the digit 6 through 3 places to the left of ones. Find the digit's value after the stated moves, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 37
Multiply every expanded place-value part: three-digit amount: 876; equal copies: 7
At a classroom activity, 7 identical supply sets each contain 876 counters. Find the number of objects in all the original sets, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 38
Test divisibility by making full groups: whole number to test: 71; candidate factor: 4
At a classroom activity, 71 counters are packed in groups of exactly 4. Find the number of complete groups and the remainder, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 39
Repeat a fractional amount: quarters in each portion: 4; number of portions: 7
A plan for a classroom activity calls for 7 portions, each 4/4 of a unit. Find the amount needed for the original portions, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapterGrade 4 · Chapter 40
Keep cents aligned when adding money: first amount: 710 cents; second amount: 155 cents
An illustrated budget for a classroom activity has costs of $7.10 and $1.55. Find the original combined cost in cents and dollars, explain the calculation, and check a related question.
Question · Worked solution · Animated example
Open practice chapter