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.
Khan Academy ResourcesMultiply without regroupingMultiply with regroupingMultiply 2-digit numbersMultiply using partial productsMultiply 2-digits by 1-digit with area modelsMultiply 2-digit numbers with area modelsMultiply with partial products (2-digit numbers)Multiplying 10sMultiply 3- and 4-digits by 1-digit with area modelsMultiply 3- and 4-digits by 1-digit with distributive propertyMultiply 2-digits by 1-digit with distributive propertyComparing with multiplication: magicMultiplying with area model: 78 x 65Multiplying two 2-digit numbers using partial productsMultiplying 3-digit by 1-digit (regrouping)Multiplying 3-digit by 1-digitMultiplying with area model: 16 x 27Multiplying 10sMultiplying 2-digit numbersMultiplying 2-digits by 1-digit with partial productsUsing area model and properties to multiply Multiplying with area model: 6 x 7981
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