Here comes the SUM, doo-n-doo-doo, and it's all right.
Hey there, parents and students,
Here's a recap of the past few days-
There are FACT FAMILIES, three numbers that create an addition or subtraction problem. An example is (2, 3, 5). They exist as a fact family in the following ways:
2 + 3 = 5
3 + 2 = 5
5 - 2 = 3
5 - 3 = 2
You can see here that SUBTRACTION and ADDITION are opposites of each other. In the Math World, we call those INVERSE OPERATIONS.
The parts of addition problems and subtraction problems have cool names-
in 2 + 3 = 5, both 2 and 3 are called ADDENDS. The number 5 in this case is called the SUM. When a teacher or gatekeeper asks for the sum of 35 and 45, he or she or IT is asking for the ANSWER to an addition problem.
In the story of 5 - 3 = 2, the number 2 is called the DIFFERENCE. The difference means the answer to a subtraction problem.
NOTE: The information after this sentence is not necessary!!! The number 5 in the subtraction problem is called the minuend, and the number 3 is called the subtrahend. Minuend and Subtrahend are too hard for humans to remember and have gone into hiding, along with other words like "hurdy-gurdy" and "spats".
Your student should also know about the three properties of addition:
1. Order Property of Addition-
6 + 7 = 13 is the same as 7 + 6 = 13. No matter which order of the ADDENDS,
the SUM will be the same.
2. Identity Property of Addition-
5 + 0 = 5. ANY number added with zero will have the same number as
the answer.
3. Grouping Property of Addition-
(9 + 2) + 3 =14 is the same as (2 + 3) + 9 = 14. It doesn't matter
how you group the addends, the answer will be the same.
Today, we learned about two digit addition. For some it was a review, for others, it seemed like it was the first time they ever encountered it. We will be working more on that on Thursday. I'm very honored to be your Math Teacher.
Now, I'm off to attempt to make a vegetarian corned beef brisket.
posted by Mister Der @ 12:13 PM
