This lesson builds on the previous lesson in which students composed teen numbers using a ten and some ones. Students move from using connecting cube towers to filled-in 10-frames to represent teen numbers. Students also relate their composition work and the relationship between addition and subtraction to find values that make equations true.
Students continue using double 10-frames throughout the unit. Consider making copies on card stock so they can be used repeatedly.
- Compose and decompose teen numbers into 1 ten and some number of ones.
- Find the value that makes an addition equation true, where one addend is 10.
- Usemos una decena para formar números del 11 al 19.
- Create a set of Number Cards (11-20) from the blackline master for each group of 2.
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