Add whole hundreds (missing addend)

Mental addition

Student name (optional)

Printed on the worksheet and the reward star. We never save it.

Customize

Problems

Layout

Hint

Regrouping

Regrouping means carrying (adding) or borrowing (subtracting) between places.

What to fill in

Sheet

Number of problems

Up to 56 fit on one page with these choices.

Worked example

Pictures

Game

Include answer key

Reward star

Paper:

Every click makes a new set of problems.