Here are the steps to multiply Decimals with whole numbers

a. Multiply the both number as whole Numbers

b. Now Count the number of digits to the right of the decimal point in the one decimal

c. Put the decimal point in the product by counting the digits from its rightmost place

Let take the multiplication

$1.2 \times 4$

Step 1: Multiply them as whole number

$12 \times 4 = 48$

Step 2: Count the number of digits to the right of the decimal point in the one decimal

1

Step 3: Final answer is obtained by putting the decimal point in the product by counting the same digits as obtained above from its rightmost place

$4.8$

1. $ 3 \times 1.5$

Answer

$ 3 \times 1.5= 4.5= $

2. $ 2 \times 4.4$

Answer

$ 2 \times 4.4= 8.8 $

Answer

$ 3 \times 1.5= 4.5= $

2. $ 2 \times 4.4$

Answer

$ 2 \times 4.4= 8.8 $

Here are the steps to multiply Decimals with decimals

a. Multiply the both number as whole Numbers

b. Now Count the number of digits to the right of the decimal point in both the decimals

c. Add/sum the number of digits counted

c. Put the decimal point in the product by counting the same digits as obtained above from its rightmost place

Let take the multiplication

$1.2 \times 4.2$

Step 1: Multiply them as whole number

$12 \times 42 = 504$

Step 2: Count the number of digits to the right of the decimal point in both decimal

for 1.2 , count is 1 and for 4.2 ,count is 1

step 4: Add/sum the number of digits counted

1+ 1=2

Step 3: Final answer is obtained by putting the decimal point in the product by counting the same digits as obtained above from its rightmost place

$5.04$

1. $ 3.2 \times 1.5$

Answer

$ 3.2 \times 1.5= 4.80= $

2. $ 2.1 \times 4.4$

Answer

$ 2.1 \times 4.4= 9.24 $

Answer

$ 3.2 \times 1.5= 4.80= $

2. $ 2.1 \times 4.4$

Answer

$ 2.1 \times 4.4= 9.24 $

Example

i. $4.23 \times 100 $.

Step 1: The digit remains same as in the decimals

4.23

Step 2: There are two zeroes over 1

Step 3: Shift the decimal point towards right by 2 places

4.23 becomes 423

Answer is 423

ii.$.23 \times 1000 $.

Step 1: The digit in the product remains as same as in the decimal number

.23

Step 2: There are three zeroes over 1

Step 3: Shift the decimal point towards right by 3 places

.23 becomes 230

Answer is 230

iii.$1.2 \times 100 = 120 = $

iv.$.0765 \times 10 = .765$

v.$.0145 \times 100 = 1.45$

vi. $1.067 \times 10 = 10.67$

Given below are the links of some of the reference books for class 7 math.

- Mathematics for class 7 by R S Aggarwal
- Mathematics for Class 7 by R D Sharma
- Mathematics Foundation Course For JEE/IMO/Olympiad - Class 7
- IIT Foundation Physics, Chemistry & Maths for Class 7

You can use above books for extra knowledge and practicing different questions.

Class 7 Maths Class 7 Science

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