# Biscuit factory: complex ratios

Learning Material, Learning Guide, Learning Module  |  Interactive Lesson  |  RAR

Published on 2018 August 1st

Description
Examine a pair of gears that drives a conveyor belt to an oven, including cases where the belt gear is larger than the driver. Notice that the number of rotations for each gear depends on the gear size (number of teeth). Explore the relationship between the number of teeth and the number of rotations. Build a table to compare rotations for a range of gear sizes. Look for a pattern in the number of rotations. Choose a gear to adjust the speed of a conveyor belt. For example, choose a belt gear size (15 teeth) that will complete half a rotation for every turn of the driver wheel (30 teeth). This learning object is the third in a series of six objects that progressively increase in difficulty.
Objective
1. Students use knowledge of factors and multiples to solve problems.
2. Students apply ratios to solve multiplicative problems.

#### Curriculum Information

 Education Type K to 12 Grade Level Grade 7, Grade 8, Grade 9, Grade 5, Grade 6, Grade 10 Learning Area Mathematics Content/Topic Numbers and Number Sense Geometry Measurement Statistics and Probability Patterns and Algebra Statistics and probability Patterns and algebra Intended Users Learners, Students Competencies