Even though the word technology is in the phrase Assistive Technology, it is not always about high tech. Using low tech options, such as manipulative, can be helpful for all students when teaching math concepts.
In the article 16 Fun and Free First Grade Math Games and Activities (https://tinyurl.com/w6gspte) from WeAreTeachers.com there are a variety of hands on math activities, some of which can be adapted for higher level math concepts. Many of these activities could be used as indoor recess game options as well, such as 100 chart battleship, dot arrangement bowling or Shut-The-Box.
Take a look at these great math game and activity ideas to determine how you can use them in your classroom today.