Kindergarten Spring Math — Compose/Decompose to 10, Addition & Subtraction within 10, Teen Numbers as Ten-and-Ones, Measurement, and Classification
Math · AT
K
math.gK.s.at.add_within_10
Addition within 10 using concrete and pictorial strategies (K.OA.A.1, K.OA.A.5)
Add two whole numbers whose sum is within 10. Represent addition with objects (concrete), fingers, mental images, drawings, sounds (e.g., claps), acting out, expressions (5+3), and equations (5+3=8). Use strategies: count-all (concrete), count-on (counting up from the larger addend), and known-facts (e.g., doubles 2+2, 3+3, 5+5; near-doubles 4+5 = 4+4+1). Fluency target for K.OA.A.5: add within 5 fluently by end of unit.
Mastery threshold
90%
Min instances
18
Typical minutes
25
Spaced intervals (days)
1, 3, 7, 14, 30, 60
Prereqs
Successors
Common misconceptions
- Counts the joining set starting from 1 instead of counting on from the first addend (count-all stuck — developmental; expected early, address with rekenrek modeling).
- Re-counts the first addend during count-on, getting an answer one less than correct (e.g., 5 + 3 = 7).
- Reads the equation right-to-left as 'equals 8 is 5 + 3' and inverts the operation.
- Treats + as meaning 'and' in a labeling sense rather than as an operation.
- Adds the digits of two-digit numbers (none in K, but watch for early-onset error when stretching to 10 + 3 = 13 in teen work).