Lesson objective: Solve problems converting units of time from larger units to smaller units.

This lesson provides an opportunity for students to apply their knowledge and understanding of conversions of time to a real-life situation. Students are asked to figure out if "Oliver" has read enough in 1 week to earn a raffle ticket. The reading log is recorded in minutes and needs to be converted into seconds to see if the goal of 9,000 seconds of reading was reached.

Key Concept students will use:

- Multiplicative comparison can be used to convert units of time.

Skills students will use:

- multiplication of one-digit whole numbers by multiples of 10 using strategies based on place value and properties of operations (3.NBT.A.3)
- multiplication with larger numbers (Grade 4, Unit 2)
- addition and subtraction (Grade 3, Unit 3)
- customary conversions of time

Students engage in Mathematical Practice 2 (reason abstractly and quantitatively as they) as they reason that if they read for 130 minutes, and there are 60 seconds in 1 minute, then they have read for 7,800 seconds.

**Key vocabulary: **

- convert
- function table
- minute
- second