Subscribe to our YouTube channel for the latest videos, updates, and tips.


Multiply a Number

How to multiply a number by 10, 100.....?

When we multiply a number by 10, the value of the number increases and the digits of the number move one place to the left on the place value chart. 

(a) 24 × 10 

2 4 × 1 0 = 2 4 0 

(b) 372 × 10

3 7 2 × 1 0 = 3 7 2 0 

Similarly, on multiplying by 100, the value of the number increases and the digits of the number move two places to the left on the place value chart. 

(a) 36 × 100 

3 6 × 1 0 0 = 3 6 0 0 

(b) 493 × 100 

4 9 3 × 1 0 0 = 4 9 3 0 0

The number of places the digits shift is equal to the number of zeros in the multiplier.

Multiply by 10 — digits shift one place to the left.

Multiply by 100 — digits shift two places to the left.

Multiply by 1000 — digits shift three places to the left.



How to multiply a number by 200, 300 400.....?

(i) 27 × 200

= 27 × 2 × 100

First we multiply the non - zero digits.

27 × 2 = 54

Then we count the number of zeros in both the factors and place them at the end.

27 × 200 = 5400

(ii) 346 × 300

346 × 3 = 1038

There are 2 zeros in the two factors.

Place the zeros at the end.

Answer: 103800

(iii) 240 × 400

24 × 4 = 96

There are 3 zeros in the factors.

(one in 240 and two in 300).

Answer: 96000

Related Concept

Addition

Word Problems on Addition

Subtraction

Check for Subtraction and Addition

Word Problems Involving Addition and Subtraction

Estimating Sums and Differences

Find the Missing Digits

Multiplication

Multiply a Number by a 2-Digit Number

Multiplication of a Number by a 3-Digit Number

Multiply a Number

Estimating Products

Word Problems on Multiplication

Multiplication and Division

Terms Used in Division

Division of Two-Digit by a One-Digit Numbers

Division of Four-Digit by a One-Digit Numbers

Division by 10 and 100 and 1000

Dividing Numbers

Estimating the Quotient

Division by Two-Digit Numbers

Word Problems on Division




4th Grade Math Activities

From Multiply a Number to HOME PAGE




Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.



New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.




Share this page: What’s this?

Recent Articles

  1. 5th Grade Circle Worksheet | Free Worksheet with Answer |Practice Math

    Jul 09, 25 02:37 AM

    Radii of the circRadii, Chords, Diameters, Semi-circles
    In 5th Grade Circle Worksheet you will get different types of questions on parts of a circle, relation between radius and diameter, interior of a circle, exterior of a circle and construction of circl…

    Read More

  2. Construction of a Circle | Working Rules | Step-by-step Explanation |

    Jul 09, 25 01:29 AM

    Parts of a Circle
    Construction of a Circle when the length of its Radius is given. Working Rules | Step I: Open the compass such that its pointer be put on initial point (i.e. O) of ruler / scale and the pencil-end be…

    Read More

  3. Combination of Addition and Subtraction | Mixed Addition & Subtraction

    Jul 08, 25 02:32 PM

    Add and Sub
    We will discuss here about the combination of addition and subtraction. The rules which can be used to solve the sums involving addition (+) and subtraction (-) together are: I: First add

    Read More

  4. Addition & Subtraction Together |Combination of addition & subtraction

    Jul 08, 25 02:23 PM

    Addition and Subtraction Together Problem
    We will solve the different types of problems involving addition and subtraction together. To show the problem involving both addition and subtraction, we first group all the numbers with ‘+’ and…

    Read More

  5. 5th Grade Circle | Radius, Interior and Exterior of a Circle|Worksheet

    Jul 08, 25 09:55 AM

    Semi-circular Region
    A circle is the set of all those point in a plane whose distance from a fixed point remains constant. The fixed point is called the centre of the circle and the constant distance is known

    Read More