11 - Sum and Difference

Define Principle:

  • To find the sum, we add the two numbers.  To find the difference, we subtract the smaller number from the bigger number.


Skill Practice

Evaluate and Apply:

  • On your own, solve the problems on page 19 of your Singapore 3A textbook

  • Create and solve three sum and difference problems and show them to your parent or learning coach.

Video Presentations that teach these principles: