Transcript Chapter 1 Vocabulary

Chapter 1
Addition and Subtraction within 1,000
2012 Edition
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
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
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
Lesson 1
even: a whole number that is evenly divisible by 2
odd: a whole number not evenly divisible by 2
Lesson 2
round: to replace a number with another
number that tells about how many or how
much
0
1
2
3
4
5
6
7
8
9
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 10 + 20
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
Lesson 3
Compatible numbers: numbers
that are easy to compute mentally
and are close to the real number.
427
+273
425
+275
700
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)