In this topic, students will:
use repeated addition to show the relationship between multiplication and addition
use number lines to join equal groups
use arrays and properties to understand multiplication
use sharing to separate equal group to think about division
use repeated subtraction to show the relationship between division and subtraction
Vocabulary:
Equal groups - groups that have the same number of items in each group
Multiplication - an operation that gives you that total number when you join equal groups
Factors - the numbers that are multiplied together
Product - the answer to a multiplication problem
Equation - a number sentence that uses an equal sign (=) to show the value to its left is the same as the value to its right
Unknown (missing number) - a symbol or letter that stands for a number in an equation
Number line - a line divided into equal units and numbered in order
Array - an arrangement of objects in equal rows and columns
Row - objects that are arranged in a line across (horizontally)
Column - objects that are arranged in a line going up and down (vertically)
Division - an operation that tells how many equal groups there are or how many are in each group
Commutative (order) property of multiplication - numbers can be multiplied in any order and the product will be the same
At-home Practice:
Supplies:
a deck of cards
Divide the deck evenly among players. Player 1 flips over 2 cards and creates a repeated addition sentence. (Ex. Player 1 flips over 4 and 3. Player 1 writes 3 + 3 + 3 + 3 = 12.) Player 2 checks Player 1's work. If it is correct, Player 1 wins the cards. If it is incorrect, Player 2 wins the cards. Continue playing until one player has all the cards.