Addition And Subtraction Problems Worksheet Page 11
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
402-3
P
S
S
roblem-
olving
kill
MAIN IDEA
I will determine when to estimate or find an exact answer.
Keith and his brother are going to build a tree
house. They will need $12 for nails, $95 for tools,
and $46 for wood. About how much money do
they need to build the tree house?
U
nderstand
What facts do you know?
•
Nails cost $12.
•
Tools cost $95.
•
Wood costs $46.
What do you need to find?
•
Find about how much money they need to build the tree house.
P
lan
Since the question says about how much money is needed,
you can estimate the sum.
S
olve
Round each amount to each greatest place value. Then add.
$12
$ 10
Round each number to
$95
$100
its greatest place value.
+ $46
+ $ 50
$160
So, about $160 is needed to build the tree house.
C
heck
Look back. Suppose the question asked for an exact answer.
Add $12, $95, and $46.
1
12
$
$95
+ $46
$153
Since $153 is close to $160, an estimate of $160 is correct.
62 Chapter 2 Solve Addition and Subtraction Problems
Gary Rhijnsburger/Masterfile
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education