1. Addition and Subtraction within 1,000
Go Math
Grade 3
Chapter 1
Addition and Subtraction within 1,000
2012 Edition

2. The Commutative Property of Addition
Math Chapter 1 Vocabulary
Lesson 1
The Commutative Property of Addition
States that you can add two or more numbers
in any order and get the same sum.
2 + 3 = 5
3 + 2 = 5

3. Math Chapter 1 Vocabulary
Lesson 1
The Identity Property of Addition states
that the sum of any number
and zero is that number
7 + 0 = 7
3 + 0 = 3

4. Math Chapter 1 Vocabulary
Lesson 1
pattern: a repeating or growing sequence
that follows a rule
1, 3, 5, ___, ___, ___
rule: a procedure (usually involving arithmetic operations) to determine an “output” value from an “input” value
The rule for the pattern is add 2 or +2

5. Math Chapter 1 Vocabulary
Lesson 1
even: a whole number that is evenly divisible by 2
odd: a whole number not evenly divisible by 2

6. Math Chapter 1 Vocabulary
Lesson 2
round: to replace a number with another number that tells about how many or how much
5 or greater go up to the next tens, hundreds or thousands.
Less than 5 stay at the current tens, hundresds, or thousands.
25 rounded to the nearest 10 = 30
23 rounded to the nearest

7. Math Chapter 1 Vocabulary
Lesson 3
An estimate is a number close to the exact amount
29 rounded to the nearest ten is 30
179 rounded to the nearest hundred is 200

8. Math Chapter 1 Vocabulary
Lesson 3
Compatible numbers: numbers
that are easy to compute mentally
and are close to the real number.
425
+275
700
427
+273

9. Math Chapter 1 Vocabulary
Lesson 5
The Associative Property of Addition
states that you can group addends in
different ways and still get the same sum.
It is also called the Grouping Property
(16 + 7) + 23 = 16 + (7 + 23)