1. Slide
60 seconds
In the early 1900s, teachers used to have students memorize addition facts. The largest two-digit number is 99, and the smallest two-digit number is 10. The most common two-digit combination is 36 - it appears in 6.3% of all two-digit additions.
Fun facts:
2. Open question
660 seconds
Work together in pairs: What strategies did you use to solve the two-digit addition problem? What did you learn from attempting to solve the problem?
3. Poll
300 seconds
What is the sum of 22 + 27?
- 49
- 57
- 50
- 48
4. Poll
300 seconds
What is the sum of 28 + 29?
- 57
- 51
- 67
- 59
5. Poll
300 seconds
What is the sum of 16 + 24?
- 40
- 36
- 44
- 48
6. Poll
300 seconds
What is the sum of 30 + 25?
- 55
- 51
- 45
- 60
7. Poll
300 seconds
What is the sum of 33 + 18?
- 50
- 51
- 41
- 55
8. Drawings
450 seconds
Draw a picture of a two headed dragon wearing a hat and playing a saxophone!
Made with ❤️ from Norway