## Friday, December 30, 2011

### Common Core Standard for Operations and Algebraic Thinking

Take a look at this Common Core Standard for Operations & Algebraic Thinking for Fourth Grade:

## Gain familiarity with factors and multiples.

·        4.OA.4. Find all factor pairs for a whole number in the range 1–100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1–100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1–100 is prime or composite.

Now put on your thinking cap and brainstorm with me a few ways to gain familiarity with factors and multiples. Remember that the Common Core Mathematical Standards states that our students should have mathematical understanding. What can teachers do to lead our students down the road of "Mathematical Understanding" and not drag them by their hands by TELLING them a bunch of rules?

#1 Should we give them a cute bookmark like this that lists all the prime numbers to 1000 and ask them memorize it?  Or keep the bookmark handy to use when they do their homework?
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Here is a list of all the prime numbers up to 1,000:
 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383 389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499 503 509 521 523 541 547 557 563 569 571 577 587 593 599 601 607 613 617 619 631 641 643 647 653 659 661 673 677 683 691 701 709 719 727 733 739 743 751 757 761 769 773 787 797 809 811 821 823 827 829 839 853 857 859 863 877 881 883 887 907 911 919 929 937 941 947 953 967 971 977 983 991 997
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#2 Could we use that interactive 100's chart that I talked about in the last post....   and .....?

Please share your thoughts in the comment section.  I've got some ideas and I'll share them in my next post.

Deborah Devine

1. Hey Deborah! I am so sorry to contact you this way, but I couldn't find an email address for you on your blog. I just found your blog on the Fifth Grade Flock (Teaching Blog Central) and wanted to invite you to our Middle and High School (grades 5 and up) New Year's Blog Party! We would love to have you!

http://bit.ly/uEUT06

Hope to see you there!

Kristen Bowers (aka Secondary Solutions)

2. Hi Deborah,

I teach 4th grade math. This year I taught my students the divisibility rules for 2,3,5, and 7.The students discovered that they could figure out if the larger number was prime if it wasn't divisible by these numbers. There is also a great website that has prime number mazes that I used. http://www.worksheetworks.com/math/numbers/prime-number-maze.html

On their assessment, I gave them a section of a hundreds chart and the students had to circle the numbers that were prime. They used what they had learned about the divisibility rules to cross out the numbers that weren't prime. I haven't posted the assessment to my mastery connect account yet, but will do so after the break.