Reviews and practice for third 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
Third grade · MathematicsLattice multiplication
A grid method where every square holds one single-digit product. The diagonals do the place-value work...
Third grade · MathematicsLines of symmetry
Fold the shape along the line. If the two halves land exactly on top of each other, the line is a line...
Third grade · MathematicsPartial-sums addition
Add the hundreds, add the tens, add the ones, then add those three answers. Nothing is carried at any...
Third grade · MathematicsSolving number stories
The arithmetic in a word problem is rarely the hard part. Deciding which operation the story is asking...
Third grade · MathematicsTenths and hundredths
The places after the point continue the same pattern as the places before it. Each step to the right is...
Third grade · MathematicsTrade-first subtraction
The borrowing algorithm, split into two clean stages: trade everything that needs trading first, then...
Science
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.