Tara spent 3 hours doing homework last night. She
spent 1/3 of her time on math, and 1/5 of her time on
science. Which method would provide the most
reasonable estimate of the total time Tara spent on her
math and science homework last night?
1
1
Add and
3
5
5 3
8


15 15 15
Least common
denominator of 15
1 5 5
8
1
 
to of 3 hours
3 5 15 round
15 2
1 3 3
1
  
B. Multiply by 3
5 3 15
2
When creating a painting, an artist spends about 13% of
their time setting up the lighting in their studio. They
then spend about 10% of their time pencil sketching their
paintings. If it takes the artist 6 hours to complete a
painting, which would provide the most reasonable estimate
of the total time spent on setting up the lighting and
sketching their painting?
round 13% to 15 %
15 %  10%  25%
6 hours  25%
Change 25
percent to the
decimal 0.25.
F. Multiply 6 by 0.25
Tamiko performed her 6th grade science experiment and
found that about 48% of the boys in her class preferred
Sunny D to Tropicana orange juice. If her class had 16
boys, about how many boys preferred Sunny D?
round 48% to 50 % and multiply
50%16 boys
0.5016 boys  8
about 8 boys preferredSunnyD
Sergei scored 74% on his history test. About how many
questions did he correctly answer if the test had 20
questions?
round 74% to 75 % and multiply
75% 20 test questions
0.75 20 test questions 15
Sergiocorrectly answered about 15 questions.
The Florida Marlins pitchers spend 1/6 of their practice
time on bunting. They spend 1/4 of their practice time on
stretching and running. If they practice for 4 hours prior
to a game, which method would provide the most reasonable
estimate of the total time spent on bunting, stretching, and
running?
1
1
Add and
6
4
1 2 2
 
6 2 12
1 3 3
  
4 3 12
2 3
5


12 12 12
Least common
denominator of 12
5
1
round
to of 4 hours
12 2
1
D. Multiply by 4
2