Download Parents Math Message Unit 3 Lesson 22-25

MATH MESSAGE
4TH GRADE
MATH
Unit 3: Multi-Digit Multiplication and Division
Math Parent Letter
The purpose of this newsletter is to guide
parents, guardians, and students as students
master the math concepts found in the St.
Tammany Public Schools’ Guaranteed
Curriculum aligned with the state mandated
Common Core Standards. Fourth grade Unit 3
teaches Multi-Digit Multiplication and Division.
This newsletter will address concepts found in
Unit 3, Lessons 22-25, Reasoning with
Divisibility.
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factor
products
factor pairs
multiple
Words to know
• composite number
• prime number
• associative property
Things to Remember!!!
The Commutative Property says you can swap
numbers (or change order and still get the same
answer.
2 x 3 = 6 and 3 x 2 = 6
Lessons 22-25
Reasoning with Divisibility
Identify Factors and Products
What are the two multiplication sentences that
represent the arrays?
1 x 6 = 6 and 2 x 3 = 6
The same product of 6 is represented in both
sentences.
Factors are numbers that can be multiplied to
get other numbers.
List the factors and draw an arrow to connect
the factor pairs.
We have found all the factors of 6.
1x5
Find another factor pair for 5. 5 x 1 = 5
2, 3, and 4 are not factors of 5, so 5 has only
one set of factors.
Prime numbers have exactly two factors, 1 and
itself.
Objective of Lessons 22-25
•
Find factor pairs for numbers to 100 and use
understanding of factors to define prime and
composite.
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Use division and the associative property to
test for factors and observe patterns.
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Determine whether a whole number is a
multiple of another number.
•
Explore properties of prime and composite
numbers to 100 using multiples.
How you can help at home?
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Talk with your child about the difference
Review multiplication facts.
Composite numbers have at least one other
factor beside 1 and itself.
Factors can also be written in a table.
Multiples are the numbers we say when we
skip-count by a whole number. Every number
has only a certain amount of factors but an
unlimited number of multiples. The number of
factors any number has is finite, but the number
of multiples is infinite.