English

Write all the factors of: 21

Advertisements
Advertisements

Question

Write all the factors of: 21

Answer in Brief
Advertisements

Solution

All factors of 21 are : 1, 3, 7, 21

shaalaa.com
  Is there an error in this question or solution?
Chapter 8: Playing with Numbers (Including H.C.F. and L.C.M.) - Exercise 9 (B)

APPEARS IN

Selina Concise Mathematics [English] Class 6 ICSE
Chapter 8 Playing with Numbers (Including H.C.F. and L.C.M.)
Exercise 9 (B) | Q 2.2

RELATED QUESTIONS

Without making any actual division, show that each of the following numbers is divisible by 11.

11000011


Without making any actual division, show that the following number is divisible by 8.

56008


Find whether the following number is divisible by 4: 532


Find whether the following number is divisible by 4: 9232


Find whether the following number is divisible by 8: 2536


Find whether the following number is divisible by 3: 543


In the following number, replace M by the smallest number to make resulting number divisible by 9: 76M91


In the following number, replace M by the smallest number to make resulting number divisible by 11: 39M2


In the following number, replace M by the smallest number to make resulting number divisible by 11: 3M422


State, true or false:

If a number is divisible by 18, it is divisible by 3 and 6


Write the first five multiples of the following number:
70


State if the following number is even or odd.
144


Write five three-digit numbers that are multiples of 5.


The factors of a number are 1, 2, 4, 5, 8, 10, 16, 20, 40 and 80. What is the number?


Draw a picture of factor tree.

50


Write down the first 5 multiples of the given number.

7


Throw two dice together. What are the numbers that turn up on the faces of the dice? Make a two-digit number using them. If it is a multiple of any of the numbers written next to the circles, you can write it in that circle. Then it is your friend’s turn. The one who can write more numbers in 10 rounds is the winner.

Hint: I have 3 and 2 on my dice. If I make 23, it is not the multiple of any of the numbers. So I will make 32, which is a multiple of 4, and write it in the red circle.


More tamarind seeds

Ammini is arranging 12 tamarind seeds in the form of different rectangles. Try to make more rectangles like this using 12 tamarind seeds. How many different rectangles can you make? 


If there are 15 tamarind seeds how many rectangles can you make?


Complete the multiplication chart given here.

Look at the green boxes in the chart. These show how we can get 12 by multiplying different numbers.

12 = 4 × 3, so 12 is a multiple of both 4 and 3. 12 is also a multiple of 6 and 2, as well as 12 and 1. We say 1, 2, 3, 4, 6, 12 are factors of 12.


What are the factors of 36?


Try drawing the factor tree using other numbers also.


Rani, Geetha, and Naseema live near each other. The distance from their house to the road is 90 feet. They decided to tile the path to the road. They all bought tiles of different designs and lengths. Rani the shortest tile, Geetha bought the one and Naseema bought the longest one. If they could tile the path without cutting any of the tiles what is the size of the tiles each has bought? Suggest 3 different solutions. Explain how you get this answer.


Write first five multiples of 9.


Find all the multiples of 9 up to 100.


Write all the factors of the following number.

24


Write all the factors of the following number.

18


Common factors of two numbers are:


If 6 is a common factor of two numbers, which could be the pair?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×