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31 sec
Grade 1 · AI-assisted teaching
Subtraction you can see: twelve minus two
AI-assisted presenter with an American male AI voice. Watch twelve counters become ten when two move into the tray, then check the result by putting them back: 12 − 2 = 10 and 10 + 2 = 12.
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26 sec
Grade 1 · AI-assisted teaching
Addition: four join three
AI-assisted presenter with an American male AI voice. Watch four counters join three to make seven, then add one more and count eight. Try the same addition question after the clip.
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26 sec
Grade 2 · AI-assisted teaching
Place value: build 234
AI-assisted presenter with an American male AI voice. Build 234 from two hundreds, three tens, and four ones. Add one ten to see why the number becomes 244.
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26 sec
Grade 3 · AI-assisted teaching
Multiplication: seven rows of three
AI-assisted presenter with an American male AI voice. Count seven equal rows of three as 21. Add another complete row and connect 8 × 3 with 24 counters.
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16 sec
Grade 4 · AI-assisted teaching
Add eighths and regroup a whole
AI-assisted presenter with an American male AI voice. Combine five eighths and seven eighths, regroup eight pieces into a whole, and simplify the remaining four eighths to one half.
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26 sec
Grade 5 · AI-assisted teaching
Volume: stack equal layers
AI-assisted presenter with an American male AI voice. Build a rectangular prism from layers of six unit cubes. Two layers occupy 12 cubic units; a third layer makes 18.
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26 sec
Grade 6 · AI-assisted teaching
Ratios: scale both quantities
AI-assisted presenter with an American male AI voice. Scale a 3:2 ratio by six to get 18:12, then compare the 18 blue counters with all 30 counters to find a fraction of 3/5.
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26 sec
Grade 7 · AI-assisted teaching
Equations: undo both operations
AI-assisted presenter with an American male AI voice. Solve 6x + 1 = 37 by subtracting one and dividing by six on both sides. Substitute x = 6 to check the result.
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26 sec
Grade 8 · AI-assisted teaching
Lines: slope and starting value
AI-assisted presenter with an American male AI voice. Start the line y = 3x + 2 at its vertical intercept, follow a rise of three for every step right, and find the point (3, 11).
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26 sec
Grade 9 · AI-assisted teaching
Binomials: multiply every area part
AI-assisted presenter with an American male AI voice. Split a rectangle with sides x + 2 and x + 3 into four areas. When x = 2, those parts add to the same 20 square units as the full rectangle.
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16 sec
Grade 10 · AI-assisted teaching
Right triangles: six, eight, ten
AI-assisted presenter with an American male AI voice. Use the Pythagorean relationship for a right triangle with legs six and eight. Their squared lengths add to 100, so the longest side is ten.
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14 study levels

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Primary mathematics

Grade 1

30 written chapters · 2 teaching videos

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Primary mathematics