Worksheet for student answer and answer key included.
When using these in my 7th grade math classroom I did the leveled cards at the beginning of the year to assess how students did with past concepts. They could be used in previous grades at the end of the year or edited to only use the cards applicable to the grade. There are 8 total levels getting more difficult the higher the level. Level 1 starts at about a 3rd to 4th grade level of multiplication and long division of 1 to 4 digit numbers and goes up to levels 7 and 8 involving operations with integers (positive and negative).
Students start on level 1 and when completed they raise their hand to get their paper checked off. In order to advance to the next level they must have every answer correct, I relate it to a video game and how they have to pass off every step before moving on. After they have passed the level they get the level 2 card, and so on. Students get really excited and competitive with these cards and treat them like a game.
To use in class I print the questions and glue to index cards for laminating.