DIvision by single digit numbers and division by two digit numbers is considered. (tes.com)
In the K - D test, a test - taker reads from left to right eight rows of unevenly spaced, single digit numbers on three test cards as quickly and accurately as possible. (MomsTeam.com)
If there is no challenge, such as adding single digit numbers by a student who has achieved mastery in adding double - digit numbers, there is activation of the dopamine - reward network. (edutopia.org)