Kindergarten Spring Math — Compose/Decompose to 10, Addition & Subtraction within 10, Teen Numbers as Ten-and-Ones, Measurement, and Classification
Math · NS
K
math.gK.s.ns.teen_as_ten_and_ones
Compose and decompose teen numbers 11-19 as ten ones and some further ones (K.NBT.A.1)
Compose and decompose each of the numbers 11-19 into ten ones and some further ones. Understand that 14 = 10 + 4, that 14 means 'one ten and four ones,' and that this is the seed of place value. Represent on a double ten-frame (one full ten-frame + ones in a second frame), with linking-cube trains (one ten-train + extras), and as an equation 14 = 10 + 4.
Mastery threshold
85%
Min instances
14
Typical minutes
25
Spaced intervals (days)
1, 3, 7, 14, 30, 60
Prereqs
Successors
-
math.g1.f.ns.place_value_120
(not yet loaded)
-
math.g1.f.ns.tens_and_ones
(not yet loaded)
Common misconceptions
- Reads 14 as 'four-teen' but writes 41 (place-value digit-reversal — exactly the K-NBT misconception the standard targets).
- Counts the ten-frame ten by ones instead of recognizing it as a single ten (does not see the unitized ten).
- Reads 12 as 'twelve' and 11 as 'eleven' but cannot decompose either to 10 + 2 or 10 + 1 because the names don't sound like 'ten-and.'
- Treats the second ten-frame as a separate count (says 14 is 'ten and four more' but writes 10 + 4 then forgets the 4 when restating the whole).
- Skips the teen-decade boundary in counting (carryover from K-Fall): 28, 29, 20.