Math Practice Topic: Subtraction in Terms of Addition

Description: Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

Adaptive Learning Progression: The numbers get bigger (beyond 20) so that you are encouraged to apply the concept rather than do the calculation.

Sample Levels (out of 10)

Solve.

Solve.

Solve.


About Us | FAQ | Contact Us | Sales Opportunities | Terms of Use | Privacy Policy