After solving a problem,
go back and check your answer
in the problem.
Does your answer make sense?
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 to see
if your answer makes sense.
Let's look at some examples:
The state fair had a special day.
For
$3.75
you could ride all afternoon. Liz went with her friends
and paid with a
$5.00
bill.
What was her change?
Step 1:
Find
the change from $5.00 if the
price
is $3.75.
Step
2:
Subtract $3.75 from $5.00.
Step
3:
$5.00
- $3.75 = $1.25
Step
4:
Is
$1.25 a reasonable answer?
Yes,
$3.75 + a quarter ($.25) is
$4.00.
$4.00 +
a dollar more is $5.00.
Liz got to the fair at
12:00 P.M.
and left at
4:00 P.M.
How many hours was
she at the fair?
Step 1:
Find
the number of hours between
12:00
P.M. and 4 P.M.
Step
2:
Count the number of hours
between
12:00 and 4:00.
Step
3:
12:00
to 1:00 {1 hour}
1:00 to 2:00 {1 hour}
2:00 to 3:00 {1 hour}
3:00 to 4:00 {1 hour}
4
hours
Step
4:
Is 4
hours a reasonable answer?
Yes,
12:00
+ 4 hours is
4:00 P.M.
Liz rode on the ferris wheel
4
times, the roller coaster
6
times, the teacups
3
times, and the bumper cars
5
times.
How many rides did Liz go on?
Step 1:
Find
the total number of rides
that
Liz rode.
Step
2:
Add
together the numbers for
each
ride.
Step
3:
4 + 6
+ 3 + 5 + =
18 rides
Step
4:
Is 18
rides a reasonable answer?
Yes,
4 + 6 = 10
3 + 5 = 8
18
rides
in 4 hours is
reasonable.
Remember:
Check your
answer to be sure it is reasonable,
or makes sense.
Check to see
if your answer makes sense.
Let's look at some examples:
Remember:
