Looking ahead in math I see we're about to sally forth into factor trees. And looking at the answer key, I don't see any numeral 1 in the tree. Is this because it's prime? But wait, it's all about prime factorization anyway... so, is it because of the identity property.. that 1 really doesn't make a difference in the factor tree? This is a Crystal question, mainly-- :) unless there are other math genii who read this blog, which I highly doubt.
Here's the example:
45
/ \
9 5
/ \ \
3 3 5
So the prime factorization of 45 is 3, 3, and 5.
I could throw in a 1 and 45 before the 9 and the 5... see what I'm saying? So the prime factors COULD be 1, 3, 3, 5. I haven't found a satisfactory explanation for this yet in the Sadlier-Oxford math book. Waaaaaaaaaaaaah. (In keeping with todaaaaay's theeeeeeme).
I'm also doing lessons a bit out of order....so as the kids are learning the x6 multiplication table, I'm making them do /6 as well to reinforce the concept.
This week D. has begun the WASL - Washington Assessment of Student Learning. He had a good time yesterday... but the schedule originally said he'd be done at 3:15 pm. We were just about ready to walk out the door yesterday at 2:30 to go get him when he called home. He'd been done since 2 pm!! He'd been hanging out and playing, waiting for us to show up. The teachers proctoring the exam said the kids got done much sooner than was expected. So we are readjusting our schedules for tomorrow, when he resumes testing. (Today he has off).
Now S. is huuuuuuuuungry, can she eeeeeeeeat? (No, not until you finish your maaaaaaath.) She's reading as I type this. She just inserted a qw - ah, thank you, dear daughter, but get your own blog. (giggling) Ah, progress!! She's now doing x7 /7!! Good. Once we get to x8 /8, we'll call it done.
Since she is no longer paying attention to her work, but rather to me, I'm closing for now. Seeeeee you laaaaaaaater.
/ \
9 5
/ \ \
3 3 5
So the prime factorization of 45 is 3, 3, and 5.
I could throw in a 1 and 45 before the 9 and the 5... see what I'm saying? So the prime factors COULD be 1, 3, 3, 5. I haven't found a satisfactory explanation for this yet in the Sadlier-Oxford math book. Waaaaaaaaaaaaah. (In keeping with todaaaaay's theeeeeeme).
I'm also doing lessons a bit out of order....so as the kids are learning the x6 multiplication table, I'm making them do /6 as well to reinforce the concept.
This week D. has begun the WASL - Washington Assessment of Student Learning. He had a good time yesterday... but the schedule originally said he'd be done at 3:15 pm. We were just about ready to walk out the door yesterday at 2:30 to go get him when he called home. He'd been done since 2 pm!! He'd been hanging out and playing, waiting for us to show up. The teachers proctoring the exam said the kids got done much sooner than was expected. So we are readjusting our schedules for tomorrow, when he resumes testing. (Today he has off).
Now S. is huuuuuuuuungry, can she eeeeeeeeat? (No, not until you finish your maaaaaaath.) She's reading as I type this. She just inserted a qw - ah, thank you, dear daughter, but get your own blog. (giggling) Ah, progress!! She's now doing x7 /7!! Good. Once we get to x8 /8, we'll call it done.
Since she is no longer paying attention to her work, but rather to me, I'm closing for now. Seeeeee you laaaaaaaater.
1 comment:
You don't put a 1 because then you would never end your factor tree. You could keep going under the 3 with 1, 3 , then put 1 and 3 again, so forth. 1 is also not considered to be prime nor composite. The definition of prime is 2 factors; 1 only has 1 factor, so it is not prime. If you were to list ALL factors of 45 you would put 1 ie 1,3,5,9,15,45. Prime factors would be 3,3,5.
HTH!
BTW, i am in hawaii and willb e home shortly. Will recap later this week!
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