Transcript Ten Minute Math

Warm Up
1. Write the EXPANDED form and tell
the value of the RED digit in each
number.
•
23
•
894
5.
A. What are the dimensions of this
egg carton?
2. What are ALL the factors of 6?
3. 1,256 - 898
4. 687 + 865
B. What are some other ways to
arrange these eggs into arrays,
besides the array you see above?
Ten Minute Math
Today's Number: 562
• How many different addition combinations can
you use to create 562?
• You must use multiples of 10 in each equation.
– For example: 562= 500+50+10+2
• “How do you know this expression equals 562?”
• “How did you combine the multiples of 10?”
• Describe and write about your strategies.
Target the Question
• Elias runs a
concession stand at
the football stadium.
The chart shows the
cost of the items that
Elias sells.
• Isabel spent exactly
$4. She bought only
one soda and 2 other
items. What 3 items
did she buy?
Item
Cost
Hot Dog
$2
Nachos
$3
Popcorn
$1
Pickle
$0.50
Small Soda $1
Med. Soda $2
Lg. Soda
$3
Making Arrays
• Continue to work with a partner to complete a pair of arrays listed
below.
• You may use your centimeter grid paper, locking cubes or color tiles
to model the possible arrays. When you discover an array, cut it out
of grid paper and add it to the construction paper labeled with that
number.
• If you finish the arrays you were assigned, choose another set of
numbers and find all of the arrays for those two numbers.
15 and 45
24 and 48
18 and 54
29 and 58
23 and 46
17 and 34
27 and 81
21 and 42
22 and 66
16 and 64
25 and 50
19 and 38
36 and 72
*Label each array with its dimensions (for example, 6 x4 and 4 x6)
EXAMPLE of Poster on Following Slide
Example Arrays for 15 & 45
Discussion
Let’s look at the following questions:
– Which numbers have only one array? Why?
– Which numbers have a square array? Why?
– Which numbers have the most arrays? Why?
As we discuss each of the about questions,
please take notes in your math journal.
Prime numbers
17, 19, 23, 29
How many factors do these numbers have?
17x1, 1x17
19x1, 1x19
Prime Numbers are numbers with exactly
two factors- 1 and the number itself.
Composite Numbers are numbers with more
than one array, or more that two factors.
Square Numbers
16, 25, 36 and 49
What do you notice about these numbers? Their
dimensions?
4 x 4 = 16
5 x 5 = 16
Square numbers are have the same number for
both dimensions.
Can you name some other square numbers? How
do you know they are square?
How Many Groups?
1.
____ groups of 6 make 18
3.
____ groups of 11 make 33
2.
____ x 6 = 18
4.
____ x 11 = 33
Draw the groups of 11 that would
make 33.
5. How many cokes are in this case?
6. Explain how you came up with your
answer in writing.
Closure
• Review the following terms: prime number,
composite number and square number.
• How are they all relate to arrays?
• Create thinking map to display the related
terms.
• Independent Practice: Complete student
activity page 7 on actually sheet and
student activity page 8 in math notebooks
or on notebook paper.