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# Math Update for Oct. 29-Nov 1

October 28, 2018 by Kim Sorensen & Rebecca Farley

We finished up our addition and subtraction standard and both classes did great!

This next week we will continue to work on multiples, factors and prime and composite numbers.  This past Thursday we learned the divisibility rules and we will use these constantly as we examine numbers and find least common multiples and greatest common factors.

The rules we have learned so far:  A number is divisible by. .

• 2 if it is an even number
• 3 if you add the digits of the number together the sum is a multiple of 3
• 5 if the number ends in a 0 or 5
• 6 if the number is even AND the sum of the digits is a multiple of 3
• 9 if you add the digits of the number together the sum is a multiple of 9
• 10 if the number ends in a 0

• What is the 6th multiple of 5? (Ask for any number 12 and under and multiples up to the 12th)
• Is 43 prime or composite?, 35?, 3,242? (Ask for any number and then ask why!)
• What are the factors of the number 48?

IXLs that match this week’s instruction:  IXL D.4, D.5, A.14, A.15

This week we will continue to work with multiplication story problems where the third graders need to interpret what means what.  For example, if they are looking at 5 baskets of 4 apples, they need to be able to express that as 5 groups of 4 items.  This is super tricky.  Even though they can find the answer by looking at it either way, this week we are focusing on being able draw a picture that correctly shows what the story is about.  We will be practicing this over and over this week!