873 Math Blog

Today in class we did the following: correct yesterday's homework, and subtracting mixed numbers. We are also reminded that the student led. portfolios are due. on Monday. Then we had homework (sheet Mr. Harbeck gave us).

Yesterday's homework: Question 1

There are two ways that you could subtract mixed numbers. This is the first way. First, we are going to change the mixed number to an improper fraction. To do that, the denominator stays the same as long as it's the common denominator. To find the numerator, you multiply the denominator (4) by the mixed whole number (36). After, you add the numerator (144+1). Do the same for 2 3/4. Then, you could subtract. After subtracting, you have to change the improper fraction (answer) to a mixed number. To do that, you divide. So it's 134 divided by 4. Which gives you the answer of 33 2/4 or 33 1/2.

The second way for subtracting mixed numbers is to borrow. You use this if the wholes are big, and when you don't want to multiply (if the number's too big for you). To use this, you write the mixed number a different way, but still having the same amount (eg. 36= 35 4/4). Add the whole with the fraction (35 4/4 + 1/4). Then, you could subtract. Which gives you the answer (33 2/4 or 33/ 1/2).

This is another question using way 2: borrowing.

Don't forget to do your homework (worksheet). And if you're not done your eportfolios, finish it . One more thing, the 2 minutes storyboard and script are also due on Monday.

For the next scribe I pick Kristin.