Free interactive math game: Place Value Composition — 3000 + 400 + 20 + 5 = ?. Part of the Addition & Subtraction category on MathKite.
Taken from the generator that powers this exercise. A fresh set appears every time the page is opened, and the printable worksheet holds ten of them.
Building a number from its parts, which is what our whole number system rests on.
Add the pieces together, keeping each one in its own column: hundreds with hundreds, tens with tens, ones with ones.
900 + 80 + 4 gives 984.
Writing the parts side by side. 900 + 80 + 4 is 984, not 900804.