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.compose_decompose_to_10

Compose and decompose numbers within 10 using number bonds (K.OA.A.3)

Decompose any whole number from 2 to 10 into two parts in more than one way; compose two parts to make a whole within 10. Record each decomposition as a number bond and as an equation. For 10 specifically, find ALL six commutatively-distinct pairs: (0,10), (1,9), (2,8), (3,7), (4,6), (5,5). Special focus on 'partners of 10' (CCSS K.OA.A.4 'for any number 1-9, find the number that makes 10').

Mastery threshold
90%
Min instances
16
Typical minutes
25
Spaced intervals (days)
1, 3, 7, 14, 30, 60
Prereqs
Successors
Common misconceptions
  • Says '10 is 5 and 5' but cannot generate any other decomposition; treats '5 and 5' as THE decomposition of 10.
  • Counts the same counter twice when shaking-spilling — loses one-to-one in the moment of recording.
  • Treats (3, 7) and (7, 3) as different decompositions structurally rather than commutative variants of the same partition (worth noting that at K we ACCEPT both as valid responses; this is not a misconception until G1).
  • Says 10 = 6 + 5 (off by one because of counting error) and does not check by recounting.
  • Cannot produce the 'partner of' a given number 1-9 (asked 'what makes 10 with 3?', child says '10' or '3' rather than '7').

Exercise pool (10)

Diff Stem Type
2 Shake 10 two-color counters and spill them. Build the part-part-whole bar on your mat. shake spill tell 10
2 Color the ten-frame to show 10 = 6 + 4. Use blue for 6 and red for 4. fill ten frame
2 What is the partner of 7 to make 10? Show on the ten-frame. partner of 10
2 Show 9 on the rekenrek. How many more beads do you need to make 10? rekenrek show
2 Draw a line between each number and its PARTNER of 10. (Provided: numbers 1-9 on left, numbers 1-9 on right, child draws matching lines.) partner match
3 Write three different equations for ways to make 10. Start each with 10 = ___ + ___. write equation
3 Fill the blank: ___ + 8 = 10 partner of 10 abstract
3 Fill in: 4 + ___ = 10 missing addend
3 This Maya number shows one bar and two dots. What is it in our numbers? maya to standard
3 Draw 8 in Maya numerals (bars and dots). draw maya