Remedial Groups & Targeted Interventions
Deterministic grouping based on teacher-verified learning gaps. Cohorts correspond to targeted Concrete-Representational-Abstract (CPA) pedagogical activities.
Group 1: Regrouping & Tens Adjustment
Tens Column Decrement Focus
🛠 Borrow & Build (Tens Decrement Focus)
A tactile CPA intervention using base-10 blocks where students physically move a tens rod to the ones mat, cross out the tens digit, and decrement it by 1 prior to subtraction.
Group 2: Place Value & Directionality
Minuend Preservation & Directionality
🛠 Top-to-Bottom Place Value Mat (Minuend Directionality)
Addresses place-value confusion where students subtract top smaller ones from bottom larger ones (e.g., 7 - 3 = 4 in 83 - 47). Enforces top-to-bottom subtraction flow.
Group 3: Arithmetic Fact Fluency
Single-Digit Subtraction Recall
🛠 Teens Subtraction Fluency Ladder
Targeted basic arithmetic fact practice using partitioning through 10 (e.g., 13 - 7 = 13 - 3 - 4 = 6) to eliminate calculation recall slips.
Group 4: Mastery & Word Problems
Extended Subtraction Challenges
🛠 Mastery & Multi-Step Subtraction Challenges
Enrichment activities for students who have demonstrated mastery of 2-digit subtraction with regrouping.