# Mixed Units of Time

Videos to help Grade 4 students learn how to solve problems involving mixed units of time.

Topic B: Problem Solving with Measurement

Common Core Standards: 4.OA.2, 4.OA.3, 4.MD.1, 4.MD.2, 4.NBT.5, 4.NBT.6

Related Topics:
Lesson Plans and Worksheets for Grade 4
Lesson Plans and Worksheets for all Grades

### NYS Common Core Grade 4, Module 7, Lesson 9

Lesson 9 Homework

Determine the following sums and differences. Show your work.
a. 41 min + 19 min = _______hr
b. 2hr 21 min + 39 min = _______ hr
c. 1 hr – 33 min= _______min
d. 3 hr – 33 min = _______hr_______min
e. 31 sec + 29 sec = _______min
f. 5 min – 15 sec = _______min________sec

2. Find the following sums and differences. Show your work.
a. 5 hr 30 min + 35 min = ______hr______min
b. 3 hr 15 min + 5 hr 55 min = ______hr_____min
c. 4 hr 4 min – 38 min = _______hr_______min
d. 7 hr 3 min – 4 hr 25 min = ______hr_____min
e. 3 min 20 sec + 49 sec = _______min______sec
f. 22 min 37 sec – 5 min 58 sec = ____min____sec

3. It took 5 minutes 34 seconds for Melissa’s oven to preheat to 50 degrees. That was 27 seconds slower than it took Ryan’s oven to preheat to the same temperature. How long did it take Ryan’s oven to preheat?

4. Joanna read three books. Her goal was to finish all three books in a total of 7 hours. She completed them, respectively, in 2 hours, 37 minutes; 3 hours, 9 minutes; and 1 hour, 51 minutes.
a. Did Joanna meet her goal? Write a statement to explain why or why not.
b. Joanna completed the two shortest books in one evening. How long did she spend reading that evening? How long, with her goal in mind, did that leave her to read the third book?

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