#### Math - 2018-19

# 4.9 - Elapsed Time

**The studentĀ **

**will solve**practical problems related to elapsed time in hours and minutes within a 12-hour period.

*Adopted: 2016*

### BIG IDEAS

So that when I am at the movies, I can use elapsed time to determine what time the movie will end, so that I can plan the rest of my day

So that I can use elapsed time to figure out what time lunch starts and ends

So that I can know how long it is between the beginning of school and lunch

So that I can know how long it is between the beginning of school and resource

So that I can use the concept of elapse time to organize by everyday life

### UNDERSTANDING THE STANDARD

- Elapsed time is the amount of time that has passed between two given times.
- Elapsed time should be modeled and demonstrated using analog clocks and timelines.
- Elapsed time can be found by counting on from the beginning time or counting back from the ending time.

### ESSENTIALS

**The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to**

- Solve practical problems related
to elapsed time in hours and minutes, within a 12-hour period (within a.m.,
within p.m., and across a.m. and p.m.):
- when given the beginning time and the ending time, determine the time that has elapsed;
- when given the beginning time and amount of elapsed time in hours and minutes, determine the ending time; or
- when given the ending time and the elapsed time in hours and minutes, determine the beginning time.

### KEY VOCABULARY

*Updated: Aug 22, 2018*