1.4 Section A: Units of Ten
Lessons 1-5. Add and subtract multiples of 10. Represent the base-ten structure of multiples of 10 up to 90 using towers of 10, drawings, numbers, or words.
Lessons 1-5. Add and subtract multiples of 10. Represent the base-ten structure of multiples of 10 up to 90 using towers of 10, drawings, numbers, or words.