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
● Check for Subtraction and Addition
● Word Problems Involving Addition and Subtraction
● Estimating Sums and Differences
● Multiply a Number by a 2-Digit Number
● Multiplication of a Number by a 3-Digit Number
● Word Problems on Multiplication
● 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
● Division by Two-Digit Numbers
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.
Recent Articles
-
Worksheet on Mixed Addition and Subtraction | Questions on Addition
Jan 12, 25 02:14 PM
In worksheet on mixed addition and subtraction the questions involve both addition and subtraction together; all grade students can practice the questions on addition and subtraction together. -
Estimating Sums and Differences | Estimations | Practical Calculations
Jan 12, 25 02:02 PM
For estimating sums and differences in the number we use the rounded numbers for estimations to its nearest tens, hundred, and thousand. In many practical calculations, only an approximation is requir… -
Combination of Addition and Subtraction | Mixed Addition & Subtraction
Jan 12, 25 01:36 PM
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 -
Checking Subtraction using Addition |Use Addition to Check Subtraction
Jan 12, 25 01:13 PM
We can check subtraction by adding the difference to the smaller number. Since the sum of difference and smaller number is equal to the larger number, subtraction is correct. -
Worksheet on Subtraction of 4-Digit Numbers|Subtracting 4-Digit Number
Jan 12, 25 09:04 AM
Practice the questions given in the worksheet on subtraction of 4-digit numbers. Here we will subtract two 4-digit numbers (without borrowing and with borrowing) to find the difference between them.
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.