In multiplication of a decimal by a decimal number we will learn how to find the product of a decimal by another decimal.
The rules to multiply a decimal by a decimal are:
(i) Remove the decimals of the two numbers and then take the two numbers as whole numbers and multiply.
(ii) In the product, place the decimal point after leaving digits equal to the total number of decimal places in both numbers.
(iii) Counting must always be done from the units place of the product.
Let us consider some of the following examples on multiplication of a decimal number by a decimal number.
1. Find the product of 1.2 × 1.2
First we will perform the multiplication ignoring the decimal points in multiplicant and multiplier.
Since 12 × 12 = 144
Now place the decimal point in the product to give as many decimal places in the product as there are in the multiplicant and the multiplier together.
Therefore, 1.2 × 1.2 = 1.44
2. Find the product of 2.5 × 0.05
First we will perform the multiplication ignoring the decimal points.
Since 25 × 5 = 125
Now in the multiplicant and the multiplier there are three decimal places together, so the product also must contain three decimal places.
Therefore, 2.5 × 0.05 = 0.125
3. Find the product of 193.45 × 2.5
Perform the multiplication ignoring the decimal points in multiplicant and multiplier.
Since 19345 × 25 = 483625
Here the multiplicant contains two decimal places and multiplier contains one decimal place, so together the product must contain three decimal places.
Therefore, 193.45 × 2.5 = 483.625
4. Find the product of 26.452 × 2.1
Perform the multiplication ignoring the decimal points in multiplicant and multiplier.
Since 26452 × 21 = 555492
Here the multiplicant contains three decimal places and multiplier contains one decimal place, so together the product must contain four decimal places.
Therefore, 26.452 × 2.1 = 55.5492
5. Find the product of 96.41 × 1.02
Perform the multiplication ignoring the decimal points.
Since 9641 × 102 = 983382
Here the multiplicant contains two decimal places and multiplier contains two decimal places, so together the product must contain four decimal places.
Therefore, 96.41 × 1.02 = 98.3382
6. Find the product of 830.12 × 1.53
Perform the multiplication ignoring the decimal points.
Since 83012 × 153 = 12700836
Here the multiplicant and multiplier both contains two decimal places, so together the product must contain four decimal places.
Therefore, 830.12 × 1.53 = 1270.0836
7. Find the product of 183.31 × 3.11
Perform the multiplication ignoring the decimal points.
Since 18331 × 311 = 5700941
Here the multiplicant and multiplier both contains two decimal places, so together the product must contain four decimal places.
Therefore, 183.31 × 3.11 = 570.0941
8. Find the product of 900.09 × 0.99
Perform multiplication as usual ignoring the decimal points.
Since 90009 × 099 = 8910891
Here the multiplicant and multiplier both contains two decimal places, so together the product must contain four decimal places.
Therefore, 900.09 × 0.99 = 891.0891
9. Find the product of 432.01 × 4.2
Perform multiplication as usual ignoring the decimal points.
Since 43201 × 42 = 1814442
Now place the decimal point in the product to give as many decimal places in the multiplicant and the multiplier together.
Therefore, 432.01 × 4.2 = 1814.442
10. Find the product of 501.03 × 3.33
Perform multiplication as usual ignoring the decimal points.
Since 50103 × 333 = 16684299
Now place the decimal point in the product to give as many decimal places in the multiplicant and the multiplier together.
Therefore, 501.03 × 3.33 = 1668.4299
● Decimal.
Expanded form of Decimal Fractions.
Changing Unlike to Like Decimal Fractions.
Comparison of Decimal Fractions.
Conversion of a Decimal Fraction into a Fractional Number.
Conversion of Fractions to Decimals Numbers.
Addition of Decimal Fractions.
Problems on Addition of Decimal Fractions
Subtraction of Decimal Fractions.
Problems on Subtraction of Decimal Fractions
Multiplication of a Decimal Numbers.
Multiplication of a Decimal by 10, 100, 1000
Multiplication of a Decimal by a Decimal.
Properties of Multiplication of Decimal Numbers.
Problems on Multiplication of Decimal Fractions
Division of a Decimal by a Whole Number.
Division of Decimal Fractions by Multiples.
Division of a Decimal by a Decimal.
Division of a whole number by a Decimal.
Properties of Division of Decimal Numbers
Problems on Division of Decimal Fractions
Conversion of fraction to Decimal Fraction.
5th Grade Numbers Page
5th Grade Math Problems
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