TEKS:

4.4 (C) represent the product of 2 two-digit numbers using arrays, area models, or equations, including perfect squares through 15 by 15;

4.4 (D) use strategies and algorithms, including the standard algorithm, to multiply up to a four-digit number by a one-digit number and to multiply a two-digit number by a two-digit number. Strategies may include mental math, partial products, and the commutative, associative, and distributive properties;