Problem
Josie
knows she has lost some money from her pocket.
She had 56¢ and
4 coins,
but now has:
Is Josie correct to think she has lost some money?
If so, how much has she lost?
|
Solution
Josie is
correct in thinking she has lost some money.
She
has
2 quarters and 1 penny which is
51¢.
Josie had
56¢ to start.
56¢-
51¢
= 5¢
The fourth coin would be a
nickel.
|
|
Problem
Samantha
has
4 CDs.
Samantha and Nicole have
7 CDs together.
Nicole and Rachel have
9 CDs together.
How many CDs does Rachel have?
 
|
Solution
Since Samantha
has 4 CDs,
and she and Nicole together had
7 CDs
then
4 +□=
7
□=
3
If Nicole has
3 CDs,
then
3 +∆ = 9
∆ = 6
Rachel has
6 CDs. |
Remember: