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SAT Math 17: Ratios, Rates, Proportions, & Units

NOTE: All info in this video applies to the DIGITAL SAT, but there are some points to keep in mind. Calculators are now allowed on ALL math questions (a Desmos calculator is built in to the testing app) and the “grid ins” (self-produced response questions) now allow for a wider range of answers (up to 5 digits, negative numbers, etc). Regarding calculator use, we recommend students continue to attempt the “no calculator” questions in our manual without a calculator, but if they feel they must use one, they certainly can. As for the grid-ins, those in our manual abide by the paper test rules, not the DSAT ones. CONTENTS: 00:00 - Introduction 00:45 - 17.1 Recognizing ratios, rates, props... 02:47 - 17.2 Proportions 03:29 - Setting up & solving basic proportions 07:40 - SM.256 07:43 - Example 1 10:08 - Scale models/drawings 10:19 - Example 2 12:26 - Translating "directly proportional" 15:50 - Example 3 17:42 - SM.257 17:49 - Graphing a direct proportion 18:59 - 17.3 Ratios 19:28 - Expressing ratios 20:22 - Example 4 30:15 - SM.258 30:29 - 17.4 Unit conversions 31:39 - Example 6 33:57 - Using conversion factors & cancellation 35:14 - Example 7 40:22 - SM.259 40:30 - Example 8 46:10 - Example 9 49:18 - Example 10 52:21 - SM.260 52:24 - Conversions with square or cubic units 53:15 - Example 11 58:40 - Example 12 1:01:07 - SM.261 1:01:18 - 17.5 Rate statements with per/for each 1:01:55 - Example 13 1:06:08 - Example 14 1:09:26 - SM.262 1:09:33 - 17.6 Work questions 1:12:04 - Example 15