North Penn School District
Elementary Math Parent Letter
Grade 3
Unit 2 – Chapter 1: Number Concepts
Examples for each lesson:
Lesson 1.1
Lesson 1.2
More information on this strategy is available on Animated Math Model #1.
Lesson 1.3
More information on this strategy is available on Animated Math Model #2.
Lesson 1.4
Lesson 1.5
Lesson 1.6
Lesson 1.7
More information on this strategy is available on Animated Math Model #3.
Lesson 1.8
More information on this strategy is available on Animated Math Model #4.
Lesson 1.9
Lesson 1.10
More information on this strategy is available on Animated Math Model #5.
Lesson 1.11
Lesson 1.12
Vocabulary
Associative Property of Addition – the property that states that when the grouping of addends
is changed, the sum is the same
Commutative Property of Addition – the property that states that you can add two or more
numbers in any order and get the same sum
Compatible numbers – numbers that are easy to compute mentally
Estimate – a number close to an exact amount
Identity Property of Addition – the property that states that the sum of any number and zero is
that number
Pattern – a repeating or growing sequence that follows a rule
Round – to replace a number with another number that tells about how many or about how
much