# 4.9 - Elapsed Time

The student

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

### 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