Practice problems:
1. What are the concepts and skills children need to be able to use the build up through ten to subtract strategy?
Part-Whole thinking about subtraction
Combinations that make 10, especially 9+1 and 8+2
Base 10 structure of teen numbers.
2. Which facts can be efficiently solved using the build up through ten to subtract strategy?
Facts where the minuend is greater than 10 and the subtrahend is 8 or 9
3. Solve 15-8 using the build up through ten to subtract strategy. Represent your solution process using:
a. ten frames
b. an open number line
c. Cuisenaire rods
d. number sentences (equations)