Unit 3, Lesson 13, Grade 3 icon
Unit 3, Lesson 13

Identify and use arithmetic patterns to multiply

EngageNY 60 min(s)Support for English Language Learners

This lesson focuses on the study of patterns as they relate to the fact 9 = 10 - 1. Students discover that the tens digit in the product of a nines fact (? 90) is 1 less than the multiplier and that the ones digit in the product is 10 minus the multiplier. For example, in 9 × 3 = 27, 2 = 3 - 1, and 7 = 10 - 3. They also see that the digits of a product of nines fact (? 90) produce a sum of 9, as in 27 (2 + 7 = 9).

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