In this topic, students will:
add and subtract whole numbers mentally using a variety of methods
round greater whole numbers to estimate sums and differences
add 3-digit numbers using place-value concepts and the standard algorithm
add numbers to one million with and without regrouping using the standard algorithm
use place value and the standard algorithm to subtract whole numbers
use place value and an algorithm to subtract whole numbers
use number sense and regrouping to subtract across zeros
Vocabulary:
Commutative (Order) Property of Addition - this property states that numbers can be added in any order and the sum remains the same
Identify (Zero) Property of Addition - this property states that the sum of any number and zero is the same number.
Associative (Grouping) Property of Addition - addends can be regrouped and the sum remains the same
Count up - count on from the lesser number to the greater number to find the difference of two numbers
Compensation - choosing numbers close to the numbers in a problem to make the computation easier, and then adjusting the answer for the numbers chosen
Variable - a symbol or letter that stands for a number
Algorithm - a set of steps used to solve a math problem
Inverse operations - operations that can undo each other
Count down - counting back from the greater number to the lesser number to find the difference of two numbers
Digit - the single numbers used to represent values in math
At-home Practice:
Supplies:
4 dice
Player 1 rolls all 4 dice and records the numbers as a 4-digit number. Player 1 rolls the dice again and records the numbers. Add the two numbers together to get the sum. Player 2 proceeds to roll the dice and adds the numbers together. The player with the highest score wins that round. After each round each player adds their scores together. The player with the highest score after 5 rounds wins the game.