3.MATH.4.G

Use strategies and algorithms, including the standard algorithm, to multiply a two-digit number by a one-digit number. Strategies may include mental math, partial products, and the commutative, associative, and distributive properties.

Grade 3 · Texas Essential Knowledge and Skills (TEKS) · TEKS 2012

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Vocabulary
strategiesalgorithmsstandard algorithmtwo-digit numberone-digit numbermental mathpartial productscommutative propertyassociative propertydistributive propertymultiplication
Skills
  • multiply (two-digit number by one-digit number using the standard algorithm) #dok2
  • select (appropriate strategy for multiplication) #dok2
  • apply (the commutative, associative, and distributive properties to multiplication) #dok2
  • use (mental math and partial products when multiplying) #dok2
  • explain (how different algorithms and strategies can solve the same multiplication problem) #dok3
Learning Targets
  • I can multiply a two-digit number by a one-digit number using the standard algorithm. #dok2
  • I can select and use strategies, like mental math and partial products, to multiply a two-digit number by a one-digit number. #dok2
  • I can apply the commutative, associative, and distributive properties to solve multiplication problems. #dok2
  • I can explain how different strategies and algorithms can be used to multiply two-digit numbers by one-digit numbers. #dok3
  • I can describe why a chosen multiplication strategy works for a particular problem. #dok3
Big Ideas
  • There are multiple strategies and algorithms to multiply a two-digit number by a one-digit number, and understanding them can make problem solving more flexible.
  • Understanding and applying mathematical properties, like commutative, associative, and distributive, helps in multiplying numbers efficiently and accurately.
Essential Questions
  • What strategies can you use to multiply a two-digit number by a one-digit number?
  • How do mathematical properties like the distributive property help you solve multiplication problems?
  • When would you use the standard algorithm instead of mental math or partial products to solve a multiplication problem?
  • How can you know if your answer to a multiplication problem is reasonable?
  • How are all the strategies for multiplying related to one another?