







Arrays 
20140118 

From Yesenia: Ray makes an array that has four rows of four counters. He wants to make two more arrays using the same number of counters. He wants more than one counter in each row. What two arrays can he make? Answered by Penny Nom. 





Matrices 
20131110 

From Ricky: Why must we have brackets around matrices. Why don't we just neatly write an array of entries crosswise and up and down to indicate a particular matrix? Answered by Chris Fisher. 





A number puzzle 
20120407 

From Kenya: my number is less than 25
my number of tiles will make only one rectangle
my number is odd
my number is a factor of 36 Answered by Penny Nom. 





A 2 by 9 array 
20111206 

From Rosalynn: what multiplication fact can be found by using the arrays for 2x9 and 5x9 Answered by Penny Nom. 





One factor array 
20110916 

From Hana: hi my brother a 5th grade have a question. this is what it say "i have only one factor array, and i am between two numbers 12 and 16. what number am i?" Answered by Penny Nom. 





A division sentence for an array 
20101005 

From Laura: On a math test Grace needs to look at an array and write a division sentence for the array. Grace writes 18/3=6 on her answer sheet. Describe what the array on Graces test looks like. Answered by Penny Nom. 





Rectangular arrays 
20100929 

From Kim: My 4th grader has started working on rectangular array that shows 2 factors of a number.
The problem reads on centimeter grid paper draw as many arrays as you can for each of the #'s 2,3,4, 5,6,7,,11,12,15 and 16. That would be great except I have no idea what they are talking about and I cannot offer any help to my daughter. Answered by Penny Nom. 





Arrays 
20100909 

From Susan: I'm a lawyer but evidently incredibly stupid at 4th grade math. . . .Question: cover a tabletop with 9 rows of square tiles with 9 squares in each row. How many tiles cover the tabletop? Then, the paper shows a 9x9 array and asks how it is used to solve the problem. My daughter wrote 9x9=81. The next question is "what are the products of the two smaller arrays?" ???? There are no other arrays  are we to make smaller arrays from the 9x9? how? Answered by Robert Dawson. 





Arrays 
20100121 

From Raven: Mary says that the greater the number of counters, the greater the number of different arrays you can form.
Give an example that shows that Mary is wrong. Answered by Penny Nom. 





A 4 by 4 array 
20100106 

From Patricia: Ray makes an array that has four rows of four counters. He wants to make two more arrays using the same number of counters. He wants more than one counter in each row. What two arrays can he make? Answered by Robert Dawson. 





An array 
20091028 

From felicia: what factors are shown in the array below?
**
**
**
**
**
** Answered by Penny Nom. 





Finding an Array to an Integer Linear Programming Problem 
20090512 

From Debbie: how to make an array for 3 box of juice for 25 students and 2 teacher. 1 pack of juices
hols 3boxes the answer is 9 packages but how do you make array for this Answered by Janice Cotcher. 





Arrays 
20090423 

From billie: Ray makes an array that has 4 rows of 4 counters. He wants to make 2 more arrays using the same number of counters.He wants more than 1 counter in each row.What 2 arrays can he make? what 2 can he? What is an array anyway? Answered by Robert Dawson. 





An array with 2 more rows than columns 
20090228 

From Mario: Write a division sentence modeled by an array that has 2 more rows than the number in each row. Answered by Penny Nom. 





Arrays of chairs 
20090108 

From Vickie: I am not sure how to help my son figure out one of his math journal problems.
He is in third grade and this just seems a bit much for him.
They have only been working on multiplication for about 3 weeks
and just went back to school from Christmas break.
Their other homework has been about arrays,
so I guess his teacher wants this answered in some sort of array.
Unfortunately I'm not sure.
The problem states: If you have 24 chairs find the total number
of ways the chairs can be arranged. Answered by Robert Dawson and Penny Nom. 





Arrays of 72 marbles 
20081113 

From natalie: draw four possible arrays for 72 marbles Answered by Penny Nom. 





An array of tulip bulbs 
20080906 

From Mary: My daughter had this problem on one of her tests. She forgot to ask her teacher what she did wrong. I understand she did not answer the question
in full, but what she did answer I feel is right.
Please explain to me
the correct answer. Thank you. Mary Answered by Harley Weston. 





I am a prime number 
20071031 

From sherry: I am a prime number. I can not be shared fairly except by one group. My array can only be one row.
array can only be one row. Can you please explain this out to me so I can help my child with it.
Thanks Answered by Penny Nom. 





An array for 31 
20071031 

From sherry: How do you make an array with the number 31 Answered by Penny Nom. 





Find my number using the following clues: 
20070918 

From T: Find my number using the following clues:
my number will make an array 2 rows wide
my number is greater than 5
my number is less than 30
my number will make a square array
my number is________?
I was not sure where to begin with this word problem  can you help??
Thank you,
T Answered by Penny Nom. 





A number story 
20070914 

From Roxanne: Make an array for the number sentence 4*8= 32
then they want me to write a number story for the number sentence. Answered by Penny Nom. 





Making dot arrays 
20070905 

From angela: What do we call the numbers that cannot be arranged into 2row arrays? Answered by Penny Nom. 





Arrays 
20070314 

From Charla: My 3rd grader has been given a problem about mathematical arrays.
Name two smaller arrays you can use to find the product.
7 x 6=3D ____ Answered by Diane Hanson. 





An array for a number between 60 and 85 
20070204 

From Lou and Matt: This Gr. 4 math problem is asking for an array as explained below. We can figure out an array for 60 but the problem asks that an array be created for any number between min. 60 to max. 85.
No one in the family can figure this one out... help/advice would be greatly appreciated
Gr.4 math question: Create an array for a number (qty) of 60 to 85 marbles in rows and columns. Each row has the same number marbles. No row or column can exceed 9 (nine)
Thank you! L Answered by Penny Nom. 





Can you make an array for 19? 
20070125 

From Caleb: can you make an array for 19 Answered by Penny Nom. 





Arrays 
20060928 

From Taylor and Laura: Hello. My daughter Taylor is in 4th grade and has an assignment about Arrays. My husband and I had no idea what an Array was. At least not in mathematical terms. What is an array? I don't think I ever studied this when I was a kid. Answered by Penny Nom. 





2row arrays 
20060906 

From Liz & Samantha: What do you call the numbers that cannot be arranged into 2row arrays? Answered by Penny Nom. 





Brokenline graphs and histograms 
20060216 

From George:
1. What is the main difference between a brokenline graph and a histogram? Both represent continuous variables.
2. What is the correct way to read a multiplication array: xaxis first and then yaxis, other way around or it doesn't matter?
Answered by Penny Nom. 





Arrays of 36 items 
20060201 

From A parent: My third grader brought home this math problem:
Here are five arrays for 36.
1. Lable the dimension for each array.
2. Write a multiplicatiuon sentence for each arrray. Answered by Penny Nom. 





An array problem 
20060131 

From Cynthia:
Write a number sentence for this array........
It's a rectangle box 3 down and 4 wide.
Answered by Penny Nom. 





Write the array for 3 
20060129 

From Jamie: My son is a 5th grader and came home with a math question that I can't answer. The question stated  "Write the array for 3" I don't understand how this can be done with just one number. Answered by Penny Nom. 





What are math arrays? 
20060118 

From Jeff: What are math arrays? Answered by Penny Nom. 





Arrays 
20060112 

From Sergio and Anthony:
Hi my son Anthony is in Third Grade and the question on his homework that we're having trouble answering is the following:
Name two smaller arrays you can use to find the product. 6 x 9 = 54
What are they exactly asking? Which is the correct answer?
Answered by Diane Hanson and Penny Nom. 





An array of pennies by year 
20051229 

From Sheila: What is an array? How do you create an array using 100 pennies by years? Answered by Penny Nom. 





Complete the array 
20051211 

From Ginger:
Make the sum of these number add up to six.
Going across, down, corner to corner. Using the number 4, 2, 0 only.
Answered by Penny Nom. 





Arrays 
20051017 

From Danette: My son's fourth grade workbook is asking him to draw four possible arrays for 72 marbles.
I don't understand what they mean Answered by Penny Nom. 





Who is taller: John or Mary? 
20050914 

From Ulises: All the students in a school are arranged in a rectangular array. After that, the tallest student in each row was chosen, and then among these John Smith happened to be the shortest.Then, in each column, the shortest student was chosen, and Mary Brown was the tallest of these. Who is taller: John or Mary? Answered by Penny Nom and Claude Tardif. 





Arrays 
20040423 

From Jan: 4x7 = 28
How many arrays can this have? How do you determine the arrays??? Answered by Penny Nom. 





Arrays 
20040219 

From A parent: please demonstrate mathematical arrays fro a 3rd grader Answered by Penny Nom. 





Arrays of pennies 
20040117 

From Kathleen: How do I create an array of 100 pennies? Answered by Penny Nom. 





Two row arrays 
20030903 

From Madalyn: My question is, what are #'s that can not be arranged in two row arrays called? Answered by Penny Nom. 





An array of pennies 
20030523 

From Saundra: If you have 100 pennies and you are suppose to make an array do you arrange the pennies by date? Answered by Penny Nom. 





Mathematical Arrays 
19980501 

From Gene Lanctot: Could someone please explain what a mathematical or arithmetical array is? The array in question is used in grade three math in Ontario. I would also like to know what its purpose is. Answered by Harley Weston. 





Le terme 
20030401 

From Francine: Je suis une enseignante de 5e/6e et j'aimerais savoir comment on traduit le terme "array" en français. Answered by Claude Tardif. 

