Grade 4 math, as an adventure

48 4th grade topics in six worlds: The Australian Outback, The Andes and Patagonia, The Rainforests of Borneo, Alaska and the Yukon, The Galápagos Islands and The Grasslands and Forests of India. In each world, characters guarding eggs ask story problems. Solve them to claim the egg, warm it and hatch a hybrid animal.

The six worlds of Grade 4

• World 1: The Australian Outback

  Big Numbers

  Numbers up to 100,000, rounding, and multiplying and dividing multi-digit numbers.

  See topics and a sample problem

• World 2: The Andes and Patagonia

  Factors & Patterns

  Times-as-many comparisons, multi-step word problems, factors, multiples and patterns.

  See topics and a sample problem

• World 3: The Rainforests of Borneo

  Fractions

  Equivalent fractions, mixed numbers, adding like fractions, and fractions of a set.

  See topics and a sample problem

• World 4: Alaska and the Yukon

  Measurement & Data

  Units, the 24-hour clock, money, area and perimeter, tables and line graphs.

  See topics and a sample problem

• World 5: The Galápagos Islands

  Lines, Angles & Shapes

  Parallel and perpendicular lines, angles and turns, compass directions, symmetry and tessellations.

  See topics and a sample problem

• World 6: The Grasslands and Forests of India

  Decimals

  Singapore teaches decimals to 3 places and their four operations in Primary 4; in the US they finish in grade 5.

  See topics and a sample problem

How a problem works

Problems are read, not raced: there is no timer and no lives to lose. A first wrong answer gets a tip that uses that problem’s own numbers. A second shows the problem worked out step by step. Every wrong answer we plan for is tied to a named mistake, so the grown-ups’ dashboard can show where to help and why.

Other grades: Grade 1 · Grade 2 · Grade 3 · Grade 5 · Grade 6 · Grade 7