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03-03-2011, 08:41 PM   #31
polentardmafia1
Senior Member

Join Date: Nov 2004
Location: It's Against The Law To Shoot A Squirrel Nest.
Posts: 11,724

Quote:
 Originally Posted by Emma Caroline I (We) have got arrays 2X9=18 and 9X2=18 5X9=45 and 9x5=45 How am I supposed to get a math fact using both? Would it be 2x5=10?

Look at this one Emma. With the pictures of the rows(IE: 2X9 AND 2X5 AND VICE VERSA) wouldn't a math fact to match these arrays bw any number of columns with 9 in each. 3 columns of 9 equals 27. I'm guessing and I'm old but it appears to me any number of columns of 9 would give you a similar array and a math fact. Just trying to help. This may be wrong and out of left field.

A possibility would be 2 columns of 9 items each and 5 columns of 9 items each; therefore 2 plus 5 equals 7 and 7 columns of 9 equals 63 thus 9 x 7 equals 63. this may be the math fact you are looking by using both arrays together.

Last edited by polentardmafia1 : 03-03-2011 at 08:46 PM.

 03-04-2011, 11:47 AM #32 dangerboy Senior Member     Join Date: Jun 2005 Location: auburn, at the wake/johnston county line Posts: 4,512 I would like to know using one of my favorite quote from the Jerry Seinfield Show "Who was the ad wizard that came up with this one?" Who in the world thought it to be productive to have a child draw out 60 blocks to solve one long division math homework problem. WTF? No wonder my child only had 4 math questions. It was going to take him all night to draw out those little blocks. Nope. DB taught him his own method. DB's wife
03-04-2011, 12:04 PM   #33
JenJen458
Member

Join Date: Jan 2005
Posts: 95

Quote:
 Originally Posted by Emma Caroline Please help with this 3rd grade math question What Multiplication Fact Can Be Found By Using The Arrays For 2x 9 And 5x9? I don't even understand the question!!!
My son is in 3rd grade also and I have a hard time trying to understand some of his math too.

Not sure if this is right but here is what I got math problems with a number times 9 would have digits that would equal 9 when added.

2x9=18 1+8=9
5x9=45 4+5=9
example 6x9=54 5+4=9

Hope that makes sense.

 03-04-2011, 12:08 PM #34 dangerboy Senior Member     Join Date: Jun 2005 Location: auburn, at the wake/johnston county line Posts: 4,512 is that 3rd grade math or a bar quiz question?
 03-04-2011, 01:15 PM #35 Emma Caroline Senior Member     Join Date: Mar 2008 Posts: 360 I don't know--I just put a circle around it and told him to ask his teacher. By the way--this was supposed to be a review sheet--I guess we should start going to school on weekends since having that break made him not be able to reatin that info
03-04-2011, 01:31 PM   #36
dangerboy
Senior Member

Join Date: Jun 2005
Location: auburn, at the wake/johnston county line
Posts: 4,512

Quote:
 Originally Posted by dangerboy is that 3rd grade math or a bar quiz question?

funny!

DB's wife