Estimating and Using Personal Strategies
Demonstrate an understanding of addition of numbers with answers to 10 000 and their corresponding subtractions (limited to 3- to 4-digit numerals) by:
- using personal strategies for adding and subtracting
- estimating sums and differences
- solving problems involving addition and subtraction.
You are asked to create a blog post to explain how to add three-digit numbers using mental math strategies. Think about the strategies you would include. Write your post.
Stretch Your Thinking
All stretch questions are from Open Questions for Rich Math Lessons (Number Strand) by Marian Small