Download Unit 1 - Hayes Elementary School

Unit 1
A synopsis of what your 5th grader will be learning in Unit 1 of EM:
Number theory: whole numbers and their properties
Arrays as representations of products and quotients.
Commutative property (turn around rule)
Refresher of multiplication facts using fact triangles, fact families,
games
Factors of numbers using factor rainbows and lists
Prime and composite numbers
Factor trees
Square numbers and square roots (unsquaring)
Divisibility Rules
o A number is divisible by 2 if it ends in an even number
o A number is divisible by 3 if the sum of its digits is divisible by 3
o A number is divisible by 4 if the last 2 digits are divisible by 4
o A number is divisible by 5 if the last number ends in 0 or 5
o A number is divisible by 6 if it is also divisible by both 2 and 3
o A number is divisible by 9 if the sum of its digits is divisible by 9
o A number is divisible by 10 if it the last number is a 0