

A real-world, real-cool, and really easy (most of the time) way to make math a bit more meaningful for elementary math students of all ages, especially if you happen to be about ten!
Problem number one was a subtraction problem, and the most popular strategy was the use of an open number line to add up from $267 to $323. The class then gave a go at "straight subtraction" which uses positive and negative values. Many in the class found this to be even easier to navigate, and most thought that it was faster too. Fast and accurate; you cannot beat that!
The second problem shows a very efficient execution of left to right adding. Adding the greatest place value first can help reduce large errors in calculations. I'd much rather be off by a dollar than a million dollars!
The final problem was almost universally solved by using a "generic rectangle" to multiply 16 by 12. The partial products are usually accurate, easy to calculate, fast, and easy to add up. Some students used multiplication clusters like 16 X 10 and 16 x 2 to solve the problem, and that is another fast and accurate strategy that is great for this factor combination!
These students ROCK!
The first problem was quickly identified as a "subtraction" problem, but it was solved using simple addition. This young mathematician added up from 267 to 323 on an open number line. This is kind of like what folks did in the good old days before cash registers had built in electronic calculators. They would count back the change using landmarks along the way. This student also used landmarks (easily recognized and "easy to work with numbers"), as she first "jumped from 267 to 270. This allowed her to easily add on to 270 in order to get to 300. From 300, the jump to 323 was a piece of cake. Finally, all of the jumps were totalled, and the distance between $267 and $323 was found correctly.
Also of note are the sentence restating the prompt (question) and the matching equation, These also signify a real sense of math understanding.
On the second problem, the student added from left to right, and to me that is great! Adding the largest place values first makes it less likely to make a mistake of great magnitude. Using the traditional algorithm makes it more likely to make a mistake in the larger place values, and that's a real drawback to sticking with traditional algorithmic thinking, unless you REALLY understand the method well.
2. You have all the tools you need in order to be successful. I've taught a bunch of kids, and you guys have the goods!
3. Do not stress out. This is a time to show off.
4. If a question is too difficult, skip it! It is far better to miss one item than the 23 items that come after it :-}
5. Read each question carefully. Be sure to read with "a voice" that you can hear in your head. Rereading with a voice has helped me solve so many problems over the years.
6. Make some notes to back up your mental math strategies. If you show some work, your chances of being correct go up a bunch. I have seen that most errors occur through rushed simple operations like adding or subtracting. So, don not rush (you know who I am talking to ;-} )However, please remember that you do not have time to "write a book" about each problem (again, you know who I am talking to ;-} ) .
7. Look at your final answer and see if it makes sense. Elephants do not weight 17 pounds!
PEACE!
Outlaw biker days! From 6 to 15-years-old, I do not remember a day that I did not ride a motorcycle. At 15, you were legally allowed to pilot a motorcycle that was “producing less than five brake horse power”. Somehow, I convinced my dad that my 120 MPH Honda cafĂ© racer only made 4-5 horsepower. He was not, and never will be, mechanically inclined! However, the joke would be on me as, on December 30, 1979 I left planet earth after my motorcycle rear-ended a turning car. I was taken to St. Vincent’s ER and “pronounced”—“called”—and about to be toe-tagged when an older ER nurse said that my vitals did not show due to a build up of fluid around my heart and in my lungs. She “bagged me” with a salt and ammonia mixture and saved my life. I spent the next five days in ICU. My folks say that I kept asking the same question over and over again, “Has the Gator Bowl started?” (that was the year that Clemson beat Ohio State and Woody Hayes punched Clemson linebacker Charlie Bauman in the mouth ending Hayes career). I also complained about bugs running up and down my IV drip (there were no bugs). When I left the hospital, I had blurred vision for a while and I tended to repeat myself, I tended to repeat myself. I still love cycles, and I have owned about 20, but it took me 15 years to get on one after the wreck. I do not ride today, as the costs outweigh the benefits. My 15th birthday card was a bit prophetic?
Final bit of totally useless knowledge: My whole family calls me by a different name than my CCE family. I was known to the world by my middle name, Rives, right up until I enrolled at UNF. It’s pronounced Reeeeevs. However, most of the time when people read my name it turned into Rivers, Riiiiiiiiiives, Rivas, Rico, boy with the blonde hair, or “did they misspell this?”. Being shy and unwanting of extra attention, I cringed every time I got a new teacher, because they would butcher my name and then argue that they were right, because “the silent e makes the vowel long”. Combine the middle name with the equally challenging last name, Ruark, and you simply cannot say them both without sounding like you have a mouth full of marbles. So finally, at UNF when a prof started to say “Ruh, uh Rii, uh Ria”, I broke in and said, “It’s Tom. Teee Ohhh M.” Oh, Ma Bell still can’t get with the program either. To wit,
Peace!