Exercise No. 3B

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 1:

Evaluate the following:

(a) 3 3/5 + 1/5

(b) 2 1/7 + 3 5/8

(c) 2 7/100 + 1 3/40

(d) 7 1/5 – 3 3/10

(e) 9 2/5 – 5 1/3

 

Question No. 2:

Evaluate the following:

(a) 4/7 + 5/21 + 11/42

(b) 5/8 + 21/10 – 17/20

(c) 4 2/3 + 1 3/5 – 1 1/4

(d) 4 3/5 – 1 2/15 – 2 7/9 – 2/45

 

Question No. 3:

On Thursday, Joan ran 1 17/20 km. On Friday, she ran 2 8/15 km. Find the total distance she ran in two days.

 

Question No. 4:

John has 9 5/16 litres for paint. After using 4 11/12 litres for painting a room, how much paint has he left?

 

Question No. 5:

During the school spring cleaning day, Robin and his classmates spent 1 ¼ hours and 1 1/12 hours cleaning two classrooms assigned to them respectively.

(a) Find the total time they spent.

(b) Which classroom took them longer to clean?

(c) How much longer did they spend in cleaning one classroom than the other?

 

Question No. 6:

Mary has 6 3/4 cups of flour. She used 2 7/12 cups of flour in one recipe and 2 13/24 cups of flour in another.

(a)  How much floor did she use altogether?

(b) How much floor has she left?

 

Question No. 7:

The police conduct regular anti-secret society operations among youths. On Friday night, the officers spent 3/4 hours, 1 1/2 hours and 2 1/4 hours checking on youths at three youth hangouts respectively. Find the total time the officers spent on their operation.


Answers

(from left to right)

 3b-i 3b-ii 3b-iii3b-iv

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