Scroll:Mental Sums >> Mental Sums >> saq (503)

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)  

Solve the problem below.

2100 × 20 = 21 × 2 × _____


Answer:_______________




2)  

Solve the problem below.

100 × 30 = 10 × 30 × _____


Answer:_______________




3)  

Solve the problem below.

1400 × 30 = 140 × 3 × _____


Answer:_______________




4)  

Solve the problem below.

7600 × 190 = 76 × 19 × _____


Answer:_______________




5)  

Solve the problem below.

1200 × 40 = 12 × 4 × _____


Answer:_______________




6)  

Solve the problem below.

230 × 20 = 23 × 20 × _____


Answer:_______________




7)  

Solve the problem below.

1900 × 50 = 190 × 5 × _____


Answer:_______________




8)  

Solve the problem below.

4700 × 210 = 47 × 21 × _____


Answer:_______________




9)  

Solve the problem below.

2500 × 30 = 25 × 3 × _____


Answer:_______________




10)  

Solve the problem below.

250 × 50 = 25 × 50 × _____


Answer:_______________




 

1)  

Solve the problem below.

2100 × 20 = 21 × 2 × _____

Answer: 1000


SOLUTION 1 :

Step 1: 2100 x 20 = 42 000
Step 2: 21 x 2 = 42
Step 3: 42 000 ÷ 42 = 1000



2)  

Solve the problem below.

100 × 30 = 10 × 30 × _____

Answer: 10


SOLUTION 1 :

Step 1: 100 x 30 = 3000
Step 2: 10 x 30 = 300
Step 3: 3000 ÷ 300 = 10



3)  

Solve the problem below.

1400 × 30 = 140 × 3 × _____

Answer: 100


SOLUTION 1 :

Step 1: 1400 x 30 = 42000
Step 2: 140 x 3 = 420
Step 3: 42000 ÷ 420 = 100



4)  

Solve the problem below.

7600 × 190 = 76 × 19 × _____

Answer: 1000


SOLUTION 1 :

Step 1: 7600 x 190 = 1444 000
Step 2: 76 x 19 = 1444
Step 3: 1444 000 ÷ 1444 = 1000



5)  

Solve the problem below.

1200 × 40 = 12 × 4 × _____

Answer: 1000


SOLUTION 1 :

Step 1: 1200 x 40 = 48 000
Step 2: 12 x 4 = 48
Step 3: 48 000 ÷ 48 = 1000



6)  

Solve the problem below.

230 × 20 = 23 × 20 × _____

Answer: 10


SOLUTION 1 :

Step 1: 230 x 20 = 4600
Step 2: 23 x 20 = 460
Step 3: 4600 ÷ 460 = 10



7)  

Solve the problem below.

1900 × 50 = 190 × 5 × _____

Answer: 100


SOLUTION 1 :

Step 1: 1900 x 50 = 95000
Step 2: 190 x 5 = 950
Step 3: 95000 ÷ 950 = 100



8)  

Solve the problem below.

4700 × 210 = 47 × 21 × _____

Answer: 1000


SOLUTION 1 :

Step 1: 4700 x 210 = 987 000
Step 2: 47 x 21 = 987
Step 3: 987 000 ÷ 987 = 1000



9)  

Solve the problem below.

2500 × 30 = 25 × 3 × _____

Answer: 1000


SOLUTION 1 :

Step 1: 2500 x 30 = 75 000
Step 2: 25 x 3 = 75
Step 3: 75 000 ÷ 75 = 1000



10)  

Solve the problem below.

250 × 50 = 25 × 50 × _____

Answer: 10


SOLUTION 1 :

Step 1: 250 x 50 = 12500
Step 2: 25 x 50 = 1250
Step 3: 12500 ÷ 1250 = 10