Break apart single-digit addends flexibly by creating a group of 10 -- and the rest. This is a crucial key skill for making math easier. Students make 10 first (an easy number to add on to) to find the total, instead of counting.
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
Solidify understanding of teen numbers as 10 and some more by using quick images. Instantly recognize a full ten frame is 10. Subitize the bottom ten frame to know how many more. Add both parts to find the total. Start by asking "How many?" Build number sense by asking "How many more make 20?" Prerequisites: K-103 ○ K-67
Use ten frames to find an unknown part in an addition equation. 5 + __ = 7? Visualize 5 on a ten frame – a full top row. Now imagine 7 – a full top row and 2 more. What's the "change" – how many need to be added to 5 to make 7? Since 5+2 = 7, the part needing to be added is 2. Draw to check for accuracy. Prerequisites: K-87, K-86 ○ K-80