These are two minute versions of the Spaceship Math subtraction worksheets with 80 and 100 problems per page.
Similar to the worksheets in the previous section, these subtraction worksheets slowly introduce a small numbers of subtraction facts with each level. Students should practice each level until they have demonstrated competence with the new facts before going to the next level. These 100 problem worksheets are designed to be slightly more challenging and should be something that can be completed in two minutes or less by students. I typically use the final sets of subtraction worksheets in this section for subtraction facts review or for assessment testing.