Lesson objective: Add 2 single digit numbers with a sum less than 20 by using the make a ten strategy.
This lesson helps to build procedural skill with whole number addition. Number bonds and ten frames are used here because a ten frame reinforces a unit of ten and provides a visual of how many ones make a ten. A number bond clearly demonstrates how numbers can be broken apart into two parts. This work develops students' understanding that make a ten is an efficient strategy for adding whole numbers.
Students engage in Mathematical Practice 7 - Look for and make use of structure as they decide how to compose and decompose numbers to make a ten. By determining what how much more a number needs to make a ten and then decomposing the second number to make the ten, students are building a foundation for using the make a ten strategy for adding larger numbers.
Key vocabulary:
- add
- broken apart
- group
- number bond
- ten frame
- sum
- make-a-ten
Special materials needed:
- counters, double tens frame