Unit 4: Develop Multiplication Strategies

• Multiplication: repeated addition

• Factor: Numbers we can multiply together to get another number. 

• Product: The answer when two or more values are multiplied together. 

• Multiplier: The number that you are multiplying by, but because we can multiply the two numbers in any order, it is better to use the word "factor". 

• Array: items (such as objects, numbers, etc.) arranged in rows and/or columns. 

• Area Model: a rectangular diagram or model used for multiplication , in which the length and width of the rectangle are defined by the factors.

• Area: The size of a surface.

• Expanded Notation: Writing a number to show the value of each digit. It is shown as a sum of each digit multiplied by its matching place value (ones, tens, hundreds, etc.) 

• Partial Products: Any of the multiplication results we get leading up to an overall multiplication result. Example: below we see the partial products of 215 × 9 are 1800, 90 and 45:

(200+10+5) x 9 

200x9= 1800 10x9=90 5x9= 45

• Algebraic Notation: Using the distributive property to multiply; a shorthand way to show expanded notation.

• Arithmetic Four

• Countdown

• Product Game