Multiplying Fraction
6) a. One week Kristi worked 3 days at a department store for 3 1/2 each day. She was paid $9 a hour.how many hours did Kristi work that week?
3 1/2 x 3
3x2+1=7/2x3=21/2
= 10 1/2
6) b. One week, Kristi worked 3 days at a department store for 3 1/2 hour each day. She was paid $9.
How much did Kristi earn that week?
(3 1/2x3)x9
10 1/2x9 = 130 1/2
7) Jupiter complets about 2 2/5 rotation every 24 hours (an earth day). How many rotation does jupiter complete in one earh week?
(24x7)x2 2/5
24x7=168
168x2 2/5
168x2=336
336/5=67 1/5
8) A sailboat is sailing at 81/2 km. If the weather conditions and the current do not change, how far will the sailboat travel in 11/3 hour?
8 1/2 x 1 1/3
8x2+1=17 3x1+1=4
17/2 x 4/3=68/6
= 11 2/6
10) It takes 3/5 of a tank of gas to get to work and back each day. How much gas it used over 5 work days?
3/5x5/1=15/5
=3/1
= 3
3 tanks are used over 5 work days.
11) Owen is 2 1/4 times as old as Robin. When Robin celebraes his 8th birthday, how old will Owen be?
21/4x8/1=
9/4x8/1=
8/4x9/1=
2/1x9/1=18/1
18
Owen wil be 18 years old when Robin is 8.
9) The distance to Grandmother's house is 4/5 of the distace of uncle Glan's house. If uncle Glen's house is 3 1/2 hours away, hoe long it take to get to grandmother's house if you travel at the same speed?
3 1/2x4x5
7/2x4/5
4/2 x 7/5=14/5
simplify 24/5
It will take 24/5 hours to get to grandmother's house.
12) The Karate club is arranging a grading for it's members. It takes 3 1/4 hours to test a group of 4 candidates. How long will the club need the gym in order to process 3 groups of candidates each?
convert: 3 1/4 into 13/4
multiply: 13/4 x 13/4 x 1/4 =39/16
16 goes into 39, 27/16
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