Vocabulary
Aray
array - items (objects or numbers) that are arranged in rows and columns
Commutative Property
Commutative Property – states changing the order of the numbers when multiplying does not change the answer 5 x 4 = 4 x 5
Area Model
Area Model – a multiplication strategy using length x width = area, where factors are used for length and width and the product is the area 6 4
How many tens does it take to make 40
4
What is 5 doubled
10
factor
factor – the numbers that are multiplied in a multiplication problem
Zero property
Anything multiplied by 0 is 0
Partial Products strategy
Partial Products Strategy – a combination of the Area Model and Distributive Property
How many tens does it take to make 170
17
What is 200 doubled
400
multiplication –
to add the same number to itself several times; repeated addition 5 x 3 = 5
Identity Property
Identity Property – states when you multiply a number by 1, the product is that number
Standard algorithm for multiplication
standard algorithm for multiplication – a multiplication procedure where you follow specific steps and mathematical rules to multiply digits in each place to find a product
How many hundreds does it take to make 600
6
what is 15 doubled
30
Product
– product the result, or answer, when multiplying
Not a property but still important
Parenthesis
parentheses – symbols: ( ), used to group numbers or operations to tell us what goes together in the expression
Expanded Form
– to break up a number according to its place value and expand it to show the value of each digit
How many hundreds does it take to make 2300
23
What is 37 doubled
74
Decompose
to split up or divide a number into smaller parts *
Distributive Property
Distributive Property – states multiplying a number by a group of numbers added together (sum), is the same as doing the multiplication with each number and then adding the products
Partial Quotients Strategy
partial Quotients Strategy– a division strategy where you solve the equation by subtracting multiples until you get to zero, or have a remainder less than the divisor
How many tens does it take to make 1230
123
What is 68 doubled
136