Addition And Subtraction Problems Worksheet Page 25
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402-6
P
S
I
roblem-
olving
nvestigation
MAIN IDEA
I will choose the best strategy to solve a problem.
MARCO:
I am downloading music. So
far, I have downloaded 4 CDs. Each
CD has 14 songs.
YOUR MISSION:
Find how many songs
Marco has downloaded.
U
nderstand
Marco has downloaded 4 CDs,
and each CD has 14 songs.
Find how many songs Marco
has downloaded.
P
lan
You can organize the information in a table and use
You can organize the information in a table and use
repeated addition to find how many songs Marco has
downloaded.
S
olve
Start with 14, the number of songs on the first CD. Then
continue to add 14 for each additional CD.
CDs
Songs
14
first CD
+ 14
second CD
1
14
28
2
28
1
3
42
28
4
56
+ 14
third CD
42
42
+ 14
fourth CD
56
So, he downloaded a total of 56 songs.
C
heck
Look back. 56 - 14 = 42, 42 - 14 = 28, 28 - 14 = 14,
and 14 - 14 = 0. The answer is correct.
76 Chapter 2 Solve Addition and Subtraction Problems
Ed-Imaging
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