Chapter 2 Vocabulary
The addition property that states you can add two numbers in any order
Commutative Property
616+334
950
Estimate the sum:
365+526
900
A _________ contains numbers and at least one operation
Number expression
x=20
x+32=?
52
The addition property that states that you can change the grouping of numbers you add
Associative Property
125+46
171
Estimate the difference:
3,456,875
-1,842,126
1,000,000
Write an expression for the phrase:
38 girls, but 14 fewer boys
38-14
20+2=22
200+20+2=222
Complete the next two numbers in the pattern
2,000+200+20=2=2,222
20,000+2,000+200+20+2=22,222
145+39
39=5+34
145+5=150
150+34=184
145+39=184
What method is this an example of?
The breaking apart method
78-35
43
An estimate that is greater than the exact answer is called a:
overestimate
Write an expression for:
7 bicycles, but 12 more tricycles
7+12
k=5
8-k=?
3
The addition property that states that the sum of any number and zero is that same number
Identity Property
935-326
609
Sarah needs $275 for a new bicycle. She saved $122. Then she earned $82 babysitting. About how much more money does Sarah need? Tell whether its an over or under estimate
$75;overestimate
Westwood Elementary Students had 276 students. Then, 8 more students came. How many students were there then?
Write an expression and solve
276+8=284
32+n=44
n=?
12
If 415-377=38
Then 38+377=415
This is an example of what?
357-160
197
Rick read a book with 135 pages. Brad read a book with 295 pages. About how many pages did they read together?
400 pages
352 inches decreased by 24 inches
Write an expression and solve
352-24=328
A ________ is a symbol or letter that stands for a number.
Variable