## 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.

#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 |

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

Deborah Devine

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!

ReplyDeletehttp://bit.ly/uEUT06

Hope to see you there!

Kristen Bowers (aka Secondary Solutions)

Hi Deborah,

ReplyDeleteI 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.