← Back to course
Level 4Day 29 · Lesson 3 of 7·15 min
Subtracting with Friends of 10
Part of Level 4 — Friends of 10 in the Complete Abacus Program.
🔒
This lesson needs AbacusCoach Membership
Unlock every level of the Abacus Program and Teacher Training. Level 0 stays free forever.
View Membership →More in Level 4