There were 40 questions in a test. Rocky answered 28 questions correctly. What percentage of the questions did she answer correctly?
a) 30% b) 40% c) 60% d) 70%
28/40 x 100 = ?/1000
25 x 40 = 1000
25 x 28 = 700
700/1000 = 70% (d)
Express 8 km 60 m, as a decimal in kilometers.
8.06 km
There are 90 dogs and 60 hamsters in a pet shop. What percentage of animals in the pet shop are dogs?
a) 40% b) 50% 3) 60% 4) 66.6%
90+60= 150
90/150 = 9/15 = 0.6 x 100
= 60% (3)
100 g of cashew nuts cost $0.75. Reyna bought 3kg of cashew nuts. How much did she pay?
3000/100 = 30
0.75kg x 30
= $22.50
Mr. Eric and his friend had dinner which cost $80. In addition, they paid 7% GST. They also paid a 10% tip to a waitress.
a) How much GST did they pay on the meal only?
b) How much did they spend altogether on the dinner?
a) $80 x 7% = $5.6
b) 10% of $80 = $8
$8 + 80 = $88
$88 x 0.07 = $6.16
$88 + 6.16 = $94.16
4 similar pens cost $8.20. Find the cost of 7 such pens.
a) $2.05 b) $2.50 3) $14.35 4) $17.50
4 units = 8.20
1 unit = 8.20 / 4
1 unit = 2.05
7units = 2.05 x 7
7units = 14.35
Ivy has 240 presents. 40% of the presents are given to an orphanage. How many presents are given to the orphanage?
100% = 240
1% = 2.4
40% = 96
A kilogram of rice cost $6. What is the cost of 400g of the rice?
1kg =$6
400g= $6 / 100 = 0.6
400g = 0.6 x 4 = $2.40
A bank pays 3.5% interest at the end of each year. Football Sensation, Alan has $7800 in his bank account. He does not withdraw any of his savings. Find the total amount of money he has at the end of 1 year.
3.5% x 7800 = 273
7800 x 273 = $8073
There are 180 beads in a box. 40% of them are red beads and the rest are white beads. How many white beads are there in the box?
a) 108 b) 72 c) 45 d) 30
100% = 180
1% = 1.8
100 - 40 = 60%
1.8 x 60 = 108 (a)
There are 500 people in the park. 150 of them are women. What percentage of the people in the park are men?
500 x 2= 1000
150 x 2 = 300
300/1000 = 30%
A group of 150 pupils participated in a science contest. Their average score was 66 marks. The average score for the boys was 70 marks and for the girls, it was 60 marks. How many girls participated in the Science contest?
Total = 150 x 66 = 9900
Total Average Girls = 150 x 60 = 9000
Total - Girls = 9900 - 9000 = 900
Boys = 900/(70-60) = 90 boys
150 - 90 = 60
A plumber has two pipes. One pipe is 7 times as long as the other pipe. When he cuts 2.2m from the longer pipe, the remaining length is that of the shorter pipe. Find the length of the shorter pipe in meters.
Short Pipe = 1 unit
Long Pipe = 7 units
He cuts 4 units from the pipe.
4u = 2.2m, 1u = 2.2/4 = 0.55m
The mass of an apple is 0.286kg. A watermelon is 20 time as heavy as the apple. Find the total mass of the apple and the watermelon.
a) 0.143kg b) 2.86kg c) 5.72kg d) 6.006kg
0.286 x 10 = 2.86kg
2.86kg x 2 = 5.72kg
5.72kg + 0.286kg = 6.006kg (d)
Lynn paid $2.40 for 10 eggs. Fairy paid $1.52 for 8 eggs. How much more did Lynn pay for one egg than Fairy?
10u = 2.40
1u = 2.4/10 = 24c per egg
8u = 1.52
1u = 1.52/8 = 19 c per egg
24 - 19 = 5c more
John Su has 30 Pokemon cards. Dora has 20 more cards than John Su. What percentage of her pokemon cards must Dora give John Su so that both of them have the same number of Pokemon cards?
John Su = 30 Cards
Dora = 30 + 20 cards = 50 Cards
20/2 = 10 cards
10/50 x 100 = 20%
Baker Esther baked 160 cakes. 55% of them were red bean cakes and the rest were chocolate cakes. After selling some of the red bean cakes, the percentage of red bean cakes became 40% of the total.
a) How many cakes were left?
b) How many chocolate cakes were sold?
Before = 55/100 x 160 = 88 RB cakes
160 - 88 = 72 Choc Cakes
After = 100-40 = 60%
60% = 72 cakes
100% = 120 cakes
120 Cakes were left.
b) 120 - 72 = 48
88-48 = 40, 40 Chocs were sold