subtracting fractions

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subtracting fractions

12/11/2019

28 Comments

THE DAY:

Assembly
Math
Story
Inquiry

1) MATH:

Subtracting Fractions (PAGE 58-60)

2) WORD WORK:

Test Friday

3)FRENCH:

Cooking show due (Tuesday November 17th)

4) POST A RESPONSE:

Watch the videos below to help you understand how to use fraction strips to visualize adding and subtracting fractions
After watching ESTIMATE the sums and differences of the two fractions below. (REMEMBER TO USE BENCH MARKS of 1/4,1/2, 3/4 and 1 WHEN ESTIMATING)
Use language such as a little less than.... a little more than... almost...
EXAMPLE: 3/4 + 1/6 = The sum will be a little less than 1 because 1/6 is not quite 1/4 and if you have 3/4 you would need another 1/4 to make one whole

Now you try....

Estimate the sum or difference using bench marks. Explain you answer like in the example above:

2/5 + 2/3 =

7/8 - 1/2 =

28 Comments

Koby

12/11/2019 05:17:31 pm

First

Edmond

12/11/2019 05:17:57 pm

SECOND!!!

Krystelle

12/11/2019 05:19:52 pm

Third!

Isabel

12/11/2019 05:26:44 pm

4th!!!!!!!! YAY TOP FIVE!

Koby

12/11/2019 05:29:14 pm

2/5 is just below 1/2 since 2.5 is half of 5. 2/3 is more than half and almost makes a whole, so 2/5+2/3 is about 1 and 1 quarter as a mixed number. 7/8 is almost a whole as well. 1/2 is of course half of a whole which means subtracting would leave 3/8 left.

Sabrina

12/11/2019 05:29:18 pm

5th!

Jack

12/11/2019 06:11:10 pm

6th

weniam

12/11/2019 06:12:07 pm

7th

Jack

12/11/2019 06:20:21 pm

The answer to 2/5 + 2/3 will be more then 1 whole. How do I know? Well, first off you can subtract 2/3 from a whole. The answer would be 1/3. 2/5 is more then 1/3 so you know that when you add 2/5 the answer would be more then a whole. Let's calculate to see if this works. 1/ 1/15.
For 7/8-1/2 we know for sure it's less then a whole because none of these are even wholes. I would estimate that this wild be around 3/8. When I calculate the answer it is 3/8. How did I know? Well, I thought a hit a half of 3/8 and subtracted.

colin w

12/11/2019 06:29:16 pm

12/11/2019 06:39:12 pm

Today in math, we learned about estimating fractions. There were some ways to estimate. The answer to the first question, 2/5 + 2/3 = ? was just a bit over 1 because 1-2/3 is 1/3 and 2/5 is just a little bit more than 1/3 (2/5 is a bit larger than 2/6 which is 1/3). Well, the answer is 16/15, or 1 and 1/15. The second question was 7/8 - 1/2 = ?. Well, I know that the answer is a bit less than 1/2, or half. The reason is that 1-1/2 is 1/2, or a half. And 7/8 is just a little under 1. And the answer is 3/8!

Abdul

12/11/2019 06:50:35 pm

i was stalking the website for 2 hours just so i could be first but i gave up and now i am 9th.....

Yiming

12/11/2019 07:02:57 pm

How is it 7:00 and im 10th?

Emily K

12/11/2019 07:07:00 pm

2/5 is a little less than half because half of 5 is 2.5. 2/3 is more than half because 1.5 is half of 3. The sum will be a little over 1 whole because 2/5 is larger than 2/6. 2/6 is 1/3. I need 1/3 more to complete the whole.
7/8 is way more than half, 4 is half of 8. Now I need 1/8 to complete the whole. I also have 1/2, this means that I have one complete whole. But, I have more than just one whole. I will have one whole and a little less than half. (Does that make sense?)

Aidan

12/11/2019 07:27:08 pm

2/3 and 2/5 would be a little more than one whole because 2/3 subtracted by one whole will give you 1/3 and 2/5 is greater than 1/3 so therefore it will give you a little more than a whole. (2/3 + 2/5 = 1 and 1/5)

7/8 - 1/2, my estimate for this question would be around 3/8. How do I know? Well 7/8 is almost a whole and half is well, a half.

Abdul

12/11/2019 07:33:33 pm

Emma

12/11/2019 08:59:18 pm

2/5 + 2/3: The sum will more then one. Because 2/5 is bigger then 1/3 , 2/3 need another 1/3 to make one whole.7/8 - 1/2:The difference will be a little less then 1/2. 8/8 - 1/2 = 1/2 but 8/8 is bigger then 7/8.

Claire

12/11/2019 09:11:00 pm

2/5 is just below 1/2 and 2/3 is more than 1/2 which almost makes a whole. When you add these two numbers you would be approximately be adding 1/2 and 3/4 which equals to 1 1/4.
7/8 is almost one whole and 1/2 could also be read as 4/8. Then, when you subtract 7/8 by 4/8, it would become 3/8.

Ruby

12/11/2019 09:38:15 pm

For 2/5 + 2/3, 2/5 is less than half vut still pretty close to half and 2/3 is a little more than half so the answer would be approximately more than one. For 7/8 -1/2, 7/8 is pretty close to 1 whole and 1/2 of 8 is 4 so basically 7 - 4 which equals 3 so the answer is around 3/8.

Edmond link

12/11/2019 09:40:36 pm

I am pretty sure that the answer of 2/5 + 2/3 would be more than one whole because 1- 2/3 = 1/3 and 2/5 is just a little bit more than that. Well, the answer is 1 and 1/15. The second one is 7/8 - 1/2. Well, I know the answer is a little less than a half. The reason is that 1 subtract 1/2 equals 1/2, which is a half and 7/8 is almost one whole. The answer is 3/8.

Sabrina

12/11/2019 10:26:23 pm

Estimating

For 2/5 + 2/3 I think that the answer would be more than 1 because I you need 1 more 1/3 to make 1 whole and I know that 2/5 is more than 1/3 so it will be a bit more than 1 whole.

For 7/8 - 1/2 I think that the answer would be more than 1/3 but less than 1/2. I believe the answer is this because 7/8 - 1/2 is a bit less than 3/8 which is a bit more than 1/3 but less than 1/2.

I think that these are the answers.

Jorden

12/11/2019 11:32:31 pm

3/7 + 5/8 will be greater than 1. we can first use 1-5 / 8 equals 3/8, 3/7 and 3/8 have the same numerator, 3/7’s denominator is smaller, so 3/7 is bigger.So 3/7 + 5/8 will be greater than 1.

Denise

12/12/2019 08:29:20 am

2/5 is less then 1/2 And 2/3 is more than 1/2 which I think almost make a whole you add 1/2 and 3/4 which would be more than one the difference would be less than 1/2 eight eights -1/2 but 8/8 is bigger than 7/8

Hem

12/12/2019 08:31:06 am

2/3 + 2/5 will be a little more than 1 because 2/3 if it's subtracted by 1, it will give you 1/3 and 1/3 is less that 2/3 so it will give you a little more than a whole.

7/8 - 1/2's estimate for this question would be less than a half. I think this because 7/8 is almost a whole and a half is a half so if you subtract it, it would be a little less than a half

Abdul

12/12/2019 08:42:07 am

@Everyone, great to see the learning.

12/12/2019 09:12:16 am

1/4 + 2/3 the answer is smaller than 1, because 1/4 is less than a half, 2/3 is greater than a half. add this two up, the anwer is close to one

Maxwell

12/12/2019 09:20:56 am

2/3 + 2/5 would be just barley more than one. I know this because 2/3 needs 1 more third to become a whole, but we have 2/5. 2/5 is barley larger than 1 third, cause one third with the numerator 2, would be 2/6, but we have 2/5. 2/5 is larger than 2/6, so just barley larger than 1 whole.

7/8 - 1/2 is a easy one, just barley less than half. cause 7/8 is very close to a whole. and - 1/2 would make it barley less than half.

Edmond

12/12/2019 04:49:48 pm

last

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