Cena counting tiles
Supporting Notes on development of number sense, place value, unitizing and more ...
Focus questions:
- Notice how confident Cena is in her thinking.
- How does she visualize the space the tiles occupy?
- How does she group tiles?
- What does she know about number value?
- What does she know about unitizing?
- Was she doing so concretly or abstractly or both?
- What is it that you would be confident that Cena understands and doesn't?
Base 10 number system summary sheet:
Place value - counting tiles & noting then & ones
Video 1 Cena counts tiles & groups by two tens and four left, then count all ... (0:58)
Video 2 Cena asks to take tiles away to make 16, rearrange and count 18 ... (1:05)
Video 3 Cena shows what 8 and 1 means in 18 ... then how many? ... 9 ... (1:00)
Video 4 Cena takes 9 tiles, add 4, then 13, have enough for group of 10? extras? ... (1:23)
Video 5 Cena One ... try it and see ... 13 ... 4 ... (0:43)
Cena explains circles and stars in class ... one on one ask to show 18 ... 9 ... (2:02)
Supporting Notes on development of number sense, place value, unitizing and more ...