Scroll:Whole Numbers >> Four Operations >> ps (301)

Written Instructions:

For each Multiple Choice Question (MCQ), four options are given. One of them is the correct answer. Make your choice (1,2,3 or 4). Write your answers in the brackets provided..

For each Short Answer Question(SAQ) and Long Answer Question(LAQ), write your answers in the blanks provided.

Leave your answers in the simplest form or correct to two decimal places.


 

1)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are thrice as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 39, how many coins are there together


Answer:_______________




2)  

Parveen had a total of 220, consisting of 10 and 2 notes. Given that she had five times as many 2 notes as 10 notes, how many notes did she have


Answer:_______________




3)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are four times as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 72, how many coins are there together


Answer:_______________




4)  

Thamarai had a total of 240, consisting of 10 and 2 notes. Given that she had three times as many 2 notes as 10 notes, how many notes did she have


Answer:_______________




5)  

Kalai had a total of 90, consisting of 10 and 2 notes. Given that he had four times as many 2 notes as 10 notes, how many notes did he have


Answer:_______________




6)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are twice as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 24, how many coins are there together


Answer:_______________




7)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are thrice as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 21, how many coins are there together


Answer:_______________




8)  

Tulasi had a total of 300, consisting of 10 and 2 notes. Given that she had five times as many 2 notes as 10 notes, how many notes did she have


Answer:_______________




9)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are four times as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 12, how many coins are there together


Answer:_______________




10)  

Parveen had a total of 144, consisting of 10 and 2 notes. Given that she had three times as many 2 notes as 10 notes, how many notes did she have


Answer:_______________




 

1)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are thrice as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 39, how many coins are there together

Answer: 312


SOLUTION 1 :

Grouping method

Step 1:

0.20 + 0.10 + 0.10 + 0.10 = 0.50(1 set)

Step 2:

39 ÷ 0.50 = 78 sets

*Note: 1 set has 4 notes

Step 3:

78 x 4 = 312 notes


SOLUTION 2 :
  No. of coins x Value Total Value
10-cent 3u x 0.10 0.30
20-cent 1u x 0.20 0.20
  4u     0.50

Step 1:

$39 ÷ 0.50 = 78

Step 2:

3 units (10-cent) + 1 unit (20-cent) = 4 units

4 units = 4 x 78

           =  312



2)  

Parveen had a total of 220, consisting of 10 and 2 notes. Given that she had five times as many 2 notes as 10 notes, how many notes did she have

Answer: 66


SOLUTION 1 :

Grouping method

Step 1:

10 + 2 + 2 + 2 + 2 + 2= 20 (1 set)

Step 2:

220 ÷ 20 = 11 sets

*Note: 1 set has 6 notes

Step 3:

11 x 6 = 66 notes


SOLUTION 2 :
  No.of notes x Value Total Units
10 1 x 10 10U
2 5 x 10 10U
  6     20U

 

Step 1:

20 units = 220

1 unit = 220  ÷ 20

          = 11

Step 2:

5 units (2 notes) + 1 unit (10 notes) = 6 units

6 units = 6 x 11

            = 66 notes



3)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are four times as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 72, how many coins are there together

Answer: 600


SOLUTION 1 :
  No. of coins x Value Total Value
10-cent 4u x 0.10 0.40
20-cent 1u x 0.20 0.20
  5u     0.60

Step 1:

72 ÷ 0.60 = 120

Step 2:

4 units (10-cent) + 1 unit (20-cent) = 5 units

5 units = 5 x 120

            =  600


SOLUTION 2 :

Grouping method

Step 1:

0.20 + 0.10 + 0.10 + 0.10 + 0.10 = 0.60(1 set)

Step 2:

72 ÷ 0.60 = 120 sets

*Note: 1 set has 5 notes

Step 3:

120 x 5 = 600 notes



4)  

Thamarai had a total of 240, consisting of 10 and 2 notes. Given that she had three times as many 2 notes as 10 notes, how many notes did she have

Answer: 60


SOLUTION 1 :
  No.of notes x Value Total Value
10 1u x 10 10U
2 3u x 2 6U
  4u     16U

 

Step 1:

16 units = 240

1 unit = 240  ÷ 16

          = 15

Step 2:

3 units (2 notes) + 1 unit (10 notes) = 4 units

4 units = 4 x 15

            = 60 notes


SOLUTION 2 :

Grouping method

Step 1:

10 + 2 + 2 + 2 = 16(1 set)

Step 2:

240 ÷ 16 = 15 sets

*Note: 1 set has 4 notes

Step 3:

15 x 4 = 60 notes



5)  

Kalai had a total of 90, consisting of 10 and 2 notes. Given that he had four times as many 2 notes as 10 notes, how many notes did he have

Answer: 25


SOLUTION 1 :
  No.of notes x Value Total Units
10 1u x 10 10U
2 4u x 2 8U
  5u     18U

 

Step 1:

18 units = 90

1 unit = 90  ÷ 18

          = 5

Step 2:

4 units (2 notes) + 1 unit (10 notes) = 5 units

5 units = 5 x 5

            = 25 notes


SOLUTION 2 :

Grouping method

Step 1: 10 + 2 + 2 + 2 + 2 = 18(1 set)

Step 2: 90 ÷ 18 = 5 sets

*Note: 1 set has 5 notes

Step 3: 5 x 5 = 25 notes



6)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are twice as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 24, how many coins are there together

Answer: 180


SOLUTION 1 :

Grouping method

Step 1:

0.20 + 0.10 + 0.10 = 0.40(1 set)

Step 2:

24 ÷ 0.40 = 60 sets

*Note: 1 set has 3 notes

Step 3:

60 x 3 = 180 


SOLUTION 2 :
  No. of coins x Value Total Value
10-cent 2u x 0.10 0.20
20-cent 1u x 0.20 0.20
  3u     0.40

Step 1:

  24 ÷ 0.40 = 60

Step 2:

2 units (10-cent) + 1 unit (20-cent) = 3 units

3 units = 3 x 60

           =  180



7)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are thrice as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 21, how many coins are there together

Answer: 168


SOLUTION 1 :

Grouping method

Step 1:

0.20 + 0.10 + 0.10 + 0.10 = 0.50(1 set)

Step 2:

21 ÷ 0.50 = 42 sets

*Note: 1 set has 4 notes

Step 3:

42 x 4 = 168 notes


SOLUTION 2 :
  No. of coins x Value Total Value
10-cent 3u x 0.10 0.30
20-cent 1u x 0.20 0.20
  4u     0.50

Step 1:

$21 ÷ 0.50 = 42

Step 2:

3 units (10-cent) + 1 unit (20-cent) = 4 units

4 units = 4 x 42

           =  168



8)  

Tulasi had a total of 300, consisting of 10 and 2 notes. Given that she had five times as many 2 notes as 10 notes, how many notes did she have

Answer: 90


SOLUTION 1 :

Grouping method

Step 1:

10 + 2 + 2 + 2 + 2 + 2= 20 (1 set)

Step 2:

300 ÷ 20 = 15 sets

*Note: 1 set has 6 notes

Step 3:

15 x 6 = 90 notes


SOLUTION 2 :
  No.of notes x Value Total Units
10 1 x 10 10U
2 5 x 10 10U
  6     20U

 

Step 1:

20 units = 300

1 unit = 300  ÷ 20

          = 15

Step 2:

5 units (2 notes) + 1 unit (10 notes) = 6 units

6 units = 6 x 15

            = 90 notes



9)  

There are some coins in a box. The coins consist of 10-cent and 20-cent coins. There are four times as many 10-cent coins as 20-cent coins. If the total amount of money in the box is 12, how many coins are there together

Answer: 100


SOLUTION 1 :
  No. of coins x Value Total Value
10-cent 4u x 0.10 0.40
20-cent 1u x 0.20 0.20
  5u     0.60

Step 1:

12 ÷ 0.60 = 20

Step 2:

4 units (10-cent) + 1 unit (20-cent) = 5 units

5 units = 5 x 20

            =  100


SOLUTION 2 :

Grouping method

Step 1:

0.20 + 0.10 + 0.10 + 0.10 + 0.10 = 0.60(1 set)

Step 2:

12 ÷ 0.60 = 20 sets

*Note: 1 set has 5 notes

Step 3:

20 x 5 = 100 notes



10)  

Parveen had a total of 144, consisting of 10 and 2 notes. Given that she had three times as many 2 notes as 10 notes, how many notes did she have

Answer: 36


SOLUTION 1 :
  No.of notes x Value Total Value
10 1u x 10 10U
2 3u x 2 6U
  4u     16U

 

Step 1:

16 units = 144

1 unit = 144  ÷ 16

          = 9

Step 2:

3 units (2 notes) + 1 unit (10 notes) = 4 units

4 units = 4 x 9

            = 36 notes


SOLUTION 2 :

Grouping method

Step 1:

10 + 2 + 2 + 2 = 16(1 set)

Step 2:

144 ÷ 16 = 9 sets

*Note: 1 set has 4 notes

Step 3:

9 x 4 = 36 notes