02. Math for Molders: Ratios (en v3.0) (Duration: Approximately 3 Hours)

Content
26 modules
Rating
Course length
0 mins
Instructor
eLearning RJG®, Inc.
Released
11 Feb 2026

Description

The Ratios unit of RJG's Math for Molders course defines ratios and how they are used in the plastic injection molding industry. Specifically, formulas are taught to calculate intensification ratios, compression ratios, and screw L/D ratios.
The lessons feature practical examples related to plastic injection molding, opportunities for practice, and an assessment.
Suggested prerequisite: Math for Molders: Area (Unit 1)

1.
Ratios - Introduction (en v3.0) (Approximately 1.5 Minutes)
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2.
General Ratios - Explanation (en v3.0) (Approximately 3 Minutes)
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3.
General Ratios - Break It Down (en v3.0) (Approximately 2 Minutes)
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4.
General Ratios - Practice (en v3.0) (Approximately 10 Minutes)
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5.
General Ratios - Activity (en v3.0) (Approximately 10 Minutes)
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6.
General Ratios - Quiz (en v3.0) (Approximately 10 Minutes)
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7.
Intensification Ratio - Explanation (en v3.0) (Approximately 7 Minutes)
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8.
Intensification Ratio - Molding Application (en v3.0) (Approximately 5 Minutes)
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9.
Intensification Ratio - Break It Down (en v3.0) (Approximately 3 Minutes)
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10.
Intensification Ratio - Practice (en v3.0) (Approximately 10 Minutes)
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11.
Intensification Ratio - Activity (en v3.0) (Approximately 10 Minutes)
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12.
Intensification Ratio - Quiz (en v3.0) (Approximately 10 Minutes)
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13.
Compression Ratio - Explanation - Part 1 (en v3.0) (Approximately 5 Minutes)
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14.
Compression Ratio - Explanation - Part 2 (en v3.0) (Approximately 5 Minutes)
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15.
Compression Ratio - Molding Application (en v3.0) (Approximately 4 Minutes)
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16.
Compression Ratio - Break It Down (en v3.0) (Approximately 3 Minutes)
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17.
Compression Ratio - Practice (en v3.0) (Approximately 10 Minutes)
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18.
Compression Ratio - Activity (en v3.0) (Approximately 10 Minutes)
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19.
Compression Ratio - Quiz (en v3.0) (Approximately 10 Minutes)
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20.
Screw L/D Ratio - Explanation - Part 1 (en v3.0) (Approximately 3 Minutes)
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21.
Screw L/D Ratio - Explanation - Part 2 (en v3.0) (Approximately 3 Minutes)
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22.
Screw L/D Ratio - Molding Application (en v3.0) (Approximately 3 Minutes)
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23.
Screw L/D Ratio - Break It Down (en v3.0) (Approximately 3 Minutes)
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24.
Screw L/D Ratio - Practice (en v3.0) (Approximately 10 Minutes)
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25.
Screw L/D Ratio - Activity (en v3.0) (Approximately 10 Minutes)
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26.
Screw L/D Ratio - Quiz (en v3.0) (Approximately 10 Minutes)
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