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After you solve a problem,
check your answer.
Does it make sense?
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To solve a
problem you need to follow
these important steps:
Step 1: Understand the problem.
Step 2: Make a plan.
Step 3: Carry out the plan.
Step 4: Look Back.
✓
Check your
answer |
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To
check an answer you can:
✓
Use
estimation.
✓
Do the
opposite operation.
✓
Work the
problem again. |
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 Let's
look at examples of each one.
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Sue is shopping for school.
She buys a backpack for $18.00 and
sneakers for $39.00.
How much did she spend?
|
✓
Use
estimation.
Solution:
$18.00 + $39.00 = $57.00
✓
round $18.00
to
$20.00
round $39.00
to
$40.00
$20.00
+
$40.00
=
$60.00
$60.00
is close to
$57.00
So, your
answer is reasonable |
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Sandy is cleaning her room. She finds 12 books that she's already
read, and she
decides to give them to her 3 friends.
If each friend gets the same number of
books, how many will they each get?
|
✓
Do the
opposite operation.
Solution:
12 ÷
3 = 4 books
✓
4 x 3 =
12 |
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Stan is collecting cans to raise money for his baseball team.
He collected 24 cans on Monday, 32 on
Tuesday, and 27 on Wednesday.
How many cans has he collected in all?
|
✓
Work the
problem again.
Solution:
24 + 32 + 27
= 83
cans
✓
24
32
+ 27
83 cans |
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 Remember: |
Check your
answer to be sure it is correct. |
Click on
the check for practice.
✓
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