Common Core State Standards
CCSS.Math.Content.4.NBT Number and Operations in Base Ten
CCSS.Math.Content.4.NBT.B Use place value understanding and properties of operations to perform multi-digit arithmetic.
CCSS.Math.Content.4.NBT.B.5 Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.