Elapsed time can be a challenge for kiddos because they like to try to find the difference between two times by lining them up vertically and subtracting for the difference. In a whole-group discussion, we talk about why this won't always work. Our number system is base-10, which means when we reach 10 in a place, we must move it over to the place to the left. For example, when we get 10 ones, we turn it into 1 ten. We also borrow in groups of ten. Time does not follow these rules, so we cannot always successfully borrow or carry vertically.
I'm a wife, mother of two, and 4th grade teacher who is totally in love with her job! I teach math and science to roughly 40 kids a year. I've tried to model my classroom after this quote by Elliot Eisner - "When the joy is in the journey, the journey will be pursued." I feel very fortunate to work in an amazing school district, where it is commonplace to push students to their full potential and settle for nothing less. I truly feel blessed!!