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Identify numbers without counting. Quick images develop number sense, build confidence, and lay the foundation for place value. Subitizing how many in all, and how many more make the next multiple of 10, is the key to adding single and double-digit numbers using the Make 10s strategy.
Subitize to build number sense. Show ten frames for 3 seconds or less. Figure out how many quickly by recognizing quantities as 5 and some more. 6 is 5 and 1 more. 7 is 5 and 2 more. Encourage students to also subtilize how many are missing. If 2 are missing, there are 8. If 1 is missing, there are 9.
Prerequisites: K-25
Continue to encourage part-total thinking. Subitize both parts of a ten frame. How many are there and how many are missing – how many more are needed to make 10, the total. Subitize daily to build number sense, master the all-important combinations of 10, recognize shapes and solids, and learn geometric names.
Prerequisites: K-67 ○ K-26
Start by modeling teen numbers visually on static ten frames. Progress to quick images that encourage grouping and subitizing – figuring out how many quickly without counting – by limiting processing time. Subitize daily to develop number sense and lay the groundwork for place value.
Prerequisites: K-109 ○ K-103, K-68
