Multiplication of Numbers

Q. Find the HCF of 72, 64 and 48.

Q.

In a book shop, there were $60,05,863$ books. Out of which $4,842$ books were sold. About how many books are left in the book shop? Estimate to the nearest tens.

Q.

Estimate the following products

A) 87 X 313

B) 9 X 795

C) 898 X 785

D) 958 X 387

Show the process

Q.

What are the properties of matrix multiplication?

Q. A magazine contains 20 pages. Everyday 13, 020 copies are printed. How many pages will be printed in two days?

1. 260, 400
2. 520, 800
3. 260, 500
4. 560, 350

Q. A bicycle industry makes 3, 136 bicycles each day. Find the total number of bicycles manufactured in 15 days?

1. 47, 450
2. 47, 400
3. 47, 040
4. 47, 080

Q. There are 74 coconut cookies and 48 chocolate cookies in a jar. Estimate the total number of cookies.

1. 125
2. 100
3. 130
4. 120

Q. A taxi-driver, filled his car petrol tank with 40 litres of petrol on Monday. The next day, he filled the tank with 50 litres of petrol. If the petrol costs ₹ 44 per litre, how much did he spend in all on petrol?

Q. A box contains 1000 biscuits each weighing 5 grams. What is the weight of all the biscuits in the box in both grams and kilograms (kg)?

1. 5000 grams , 5 kg
2. 500 grams , 5 kg
3. 5000 grams , 50 kg
4. 5000 grams , 500 kg

Q.

In a cycle factory, 1, 600 bicycles were manufactured on a day. Draw tree diagram to find the number of bicycles produced in 20 days.

Q. (i) Find the LCM and HCF of 10, 15 and 20.
(ii) Find the sum of the prime factors of 1729.

Q.

Rahul and Sohan have 169 and 395 toys respectively. Estimate the total number of toys to its nearest tens.

1. 560

2. 500

3. 470

4. 570

Q.

Rita has a ribbon of length 2070 mm. Sita has a ribbon whose length is 1232 mm shorter than that of Rita's ribbon. Approximate the length of ribbon that Sita has, to nearest thousand.

1. 500

2. 1000

3. 2000

4. 1500

Q. When a positive integer is multiplied by a negative integer, the result is:

1. positive
2. negative
3. either positive or negative
4. cannot be determined

Q. There are 275 students in class IV and 238 students in class V. Estimate the total number of students in both the classes by rounding off the numbers to their nearest hundreds.

1. 500
2. 520
3. 550
4. 600

Q. The school library has 284 science books and 268 social sciences books. Estimate the difference in the number of books by rounding off to the nearest tens.

1. 10
2. 20
3. 5
4. 0

Q. How many cups are there in 12 gallons?

1. 180 cups
2. 120 cups
3. 192 cups
4. 200 cups

Q. The product of 0.3 and 0.4 is ___.

1. 0.012
2. 0.12
3. 1.2
4. 0.00012

Q. The mass of a ball is 2.5 kg. What is the mass of 10 such balls?

1. 20 kg
2. 10 kg
3. 5 kg
4. 25 kg

Q. A building has 178 offices, and each office has 79 employees. They are all invited to a party. Estimate the number of people who will attend the party if the number of employees is rounded off to the nearest tens and number of offices to the nearest hundreds.

1. 16000
2. 1600
3. 800
4. 8000

Q. A bike covers 70 km in 1 hour. How much distance (in meters) will it cover in 4 hours?

1. 280 meters
2. 2, 80, 000 meters
3. 2, 800 meters
4. 28, 000 meters

Q. A merchant had ₹78, 592 with her. She placed an order for purchasing 40 radio sets at ₹1, 200 each. How much money will remain with her after the purchase?

Q.

Following data table represents the total number of students in a school in different years. Calculate the number of students studying in the school from the year 1998 to 2002.

1. 1508

2. 1600

3. 1607

4. 1500

Q. There are 56 students in a class. If each student has 6 books, find the total number of books in the class.

1. 765
2. 245
3. 124
4. 336

Q.

The north division is invited to a party and it has a total of 178 offices and each office has 79 employees. Estimate the number of people who will attend the party by rounding off the employees to the nearest tens and the number of offices to the nearest hundreds.

1. 800

2. 8000

3. 16000

4. 1600

Q. The directions for a pain reliever recommend that an adult of 60 kg and over, takes 4 tablets every 4 hours as needed, and an adult who weighs between 40 kg and 50 kg takes only $2\frac{1}{2}$ tablets every 4 hours as needed. Each tablet weighs $\frac{4}{25}$ gram

(a) If a 72 kg adult takes 4 tablets, how many grams of pain reliever is he or she receiving ?

(b) How many grams of pain reliever is recommended dose for an adult weighing 46 kg ?

Q. The difference between the smallest $3$-digit number and greatest $2$-digit number is

1. $XX$
2. $I$
3. $XC$
4. $C$

Q. Rashi is going to plant 54 oak trees and 27 pine trees. Rashi would like to plant the trees in all rows that have the same number of trees and are made up of only one type of tree. What is the greatest number of trees Rashi can have in each row?

1. 27
2. 18
3. 3
4. 9

Q.

Multiply:
$\left(i\right).2.7\times 1.4$
$\left(ii\right).6.17\times 3.9$
$\left(iii\right).0.57\times 2$
$\left(iv\right).5.04\times 0.7$

Q. A pencil factory makes 4 colours of pencils. They put 9 of each colour pencil in each box. How many pencils does the factory put in 4 boxes?

1. $144$
2. $124$
3. $36$
4. $72$