Open Middle®
Directions: I have 2 ten-frames that have counters on them. One is full and one is not. What is the largest number I could make? What is the smallest number I could make?
Hint
Start by filling in one of your ten frames with counters.
What does it mean to be the smallest number if one of the ten frames is full and one is not?
Answer
Largest: 19
Smallest: 11
Smallest: 11
Source: Brian Kelley
If 1 ten frame is full and 1 ten frame is not: we could have 11,12,13,14,15,16,17,18 or 19, but not 20.
Jade says 10 is the largest and 11 is the smallest
We can have 19 and 11
Largest number is 19
Smallest is 11
19 is the biggest
11 is the smallest
Smallest should be 10. Because there is no indication that any markers are on the second 10-frame. This same question is on here somewhere but with one 10-frame using its rows. This does cause a contradiction.
The smallest would be 11 since the directions state that both ten-frames have counters on them.
I need help. This is a little unclear to my kindergarteners
#harderthancalculusandicantsolveit