Mathematics | Grade : 3
Domain - Number and Operations in Base Ten
Cluster - Use place value understanding and properties of operations to perform multi-digit arithmetic.
[3.NBT.A.3] - Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 x 80, 5 x 60) using strategies based on place value and properties of operations. [Note: A range of algorithms may be used.]
- Algorithm
A finite set of steps for completing a procedure, e.g., multi-digit operations (addition, subtraction, multiplication, division). (See standard 3.NBT.A.2.) - Properties of operations
[3.OA.B.5] -
Apply properties of operations to multiply. For example: When multiplying numbers order does not matter. If 6 x 4 = 24 is known, then 4 x 6 = 24 is also known (Commutative property of multiplication); The product 3 x 5 x 2 can be found by 3 x 5 = 15 then 15 x 2 = 30, or by 5 x 2 = 10 then 3 x 10 = 30 (Associative property of multiplication); When multiplying two numbers either number can be decomposed and multiplied; one can find 8 x 7 by knowing that 7 = 5 + 2 and that 8 x 5 = 40 and 8 x 2 = 16, resulting in 8 x (5 + 2) = (8 x 5) + (8 x 2) = 40 + 16 = 56 (Distributive property); When a number is multiplied by 1 the result is the same number (Identity property of 1 for multiplication). [Note: Students need not use formal terms for these properties. Students are not expected to use distributive notation]