Decimal Multiplication: Finding the Correct Decimal Point in 3.5 × 2.4 = 840

Look at the following exercise and determine the correct place of the decimal point:

3.5×2.4=840 3.5\times2.4=840

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Place the decimal point
00:03 Count the total number of digits after the decimal point
00:06 According to this sum, we'll place the decimal point in the solution
00:09 We'll move the decimal point by the sum of digits
00:12 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Look at the following exercise and determine the correct place of the decimal point:

3.5×2.4=840 3.5\times2.4=840

2

Step-by-step solution

In the number -3.5, there is one digit after the decimal point: 5.

In the number 2.4, there is one digit after the decimal point: 4.

In other words, we have two digits after the decimal point.

Therefore we will move the decimal point two places to the left to get our answer: 8.40.

3

Final Answer

8.40 \text{8}.40

Practice Quiz

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\( 0.1 \times 0.008 = \)

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