Reviews and practice for fourth grade. Each page explains one method or one topic, works through examples, and ends with questions you can check yourself. Nothing is scored and nothing is recorded.
Mathematics
Fourth grade · MathematicsAngles
An angle measures turn, not length. Two angles drawn with very different arm lengths can be exactly the...
Fourth grade · MathematicsComparing and ordering decimals
Comparing decimals goes wrong when students compare them as if they were whole numbers. Lining up the...
Fourth grade · MathematicsCounting-up subtraction
Instead of taking away, you start at the smaller number and count up to the larger one. The jumps you...
Fourth grade · MathematicsDividing by 10, 100 and 1,000
The mirror image of multiplying by ten. Digits move right, and the ones that fall past the point become...
Fourth grade · MathematicsGeometric solids
Count faces, edges and vertices carefully once and a pattern appears that holds for every solid with...
Fourth grade · MathematicsMultiplying by 10, 100 and 1,000
The digits move, and a zero appears to fill the gap. Teaching it as add a zero works until decimals...
Fourth grade · MathematicsPartial-differences subtraction
A subtraction method that never borrows. You subtract each place value separately, allow the answers to...
Fourth grade · MathematicsPartial-products multiplication
Split both numbers into place values, multiply every part by every part, and add the products. The area...
Fourth grade · MathematicsPolygons
A closed shape made only of straight sides. Everything else about polygons follows from counting those...
Fourth grade · MathematicsQuadrilaterals
Six names, one family tree. The confusing part is that the categories overlap on purpose.
Fourth grade · MathematicsReading and writing big numbers
Large numbers are not harder than small ones. They are the same three-digit pattern repeated, with a...
Fourth grade · MathematicsTriangles
Every triangle has two names: one for its sides, one for its angles. Knowing one tells you very little...
Science
Fourth grade · ScienceAnimal adaptations
An adaptation is a trait that helps an animal survive where it lives. It is inherited, not decided.
Fourth grade · ScienceElectric current and simple circuits
A current is charge on the move, and it only moves when the path it travels is unbroken. Everything...
Fourth grade · ScienceForces and motion
A force is a push or a pull. Nothing changes its motion unless the forces on it are unbalanced.
Fourth grade · ScienceHuman body systems
Each system has one job. What makes the body work is that no system does its job alone.
Fourth grade · ScienceSimple machines
A simple machine does not create energy. It changes the size or the direction of a force, and it always...
Other grades
Methods do not stop at a grade boundary. A fourth grade class often revisits a third grade subtraction page, and a sixth grade class still uses the multiplication pages.