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Multiplying by 5. A cool math trick for multiplying any number by 5 (number trick)

Updated on January 9, 2013

If you are looking for a quick way of multiplying by 5 then follow these couple of steps:

Step 1: Multiply your number by 10.

Step 2: Work out half of your answer from step 1.

Let’s put these two steps into practice.

Example 1

Use the math trick for multiplying by 5 to work out 24 × 5.

Step 1: Multiply your number by 10

24 × 10 = 240

Step 2: Work out half of your answer from step 1.

½ of 240 = 120

Example 2

Use the math trick for multiplying by 5 to work out 62 × 5.

Step 1: Multiply your number by 10

62× 10 = 620

Step 2: Work out half of your answer from step 1.

½ of 620 = 310

Example 3

Use the math trick for multiplying by 5 to work out 73 × 5.

Step 1: Multiply your number by 10

73 × 10 = 730

Step 2: Work out half of your answer from step 1.

½ of 730 = 365

Let’s take a look at a couple of examples of multiplying numbers over 100 by 5:

Example 4

Use the math trick for multiplying by 5 to work out 206 × 5.

Step 1: Multiply your number by 10

206 × 10 = 2060

Step 2: Work out half of your answer from step 1.

½ of 2060 = 1030

Example 5

Use the math trick for multiplying by 5 to work out 480 × 5.

Step 1: Multiply your number by 10

480 × 10 = 4800

Step 2: Work out half of your answer from step 1.

½ of 4800 = 2400

Let’s do one last example on a number over 1000

Example 6

Use the math trick for multiplying by 5 to work out 2846 × 5.

Step 1: Multiply your number by 10

2846 × 10 = 28460

Step 2: Work out half of your answer from step 1.

½ of 28460 = 14230

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  • profile image

    sh 4 years ago

    since my childhood i used to solve math by using these kind of tricks & techniques, indeed its way easier than the orthodox methods

  • pstraubie48 profile image

    Patricia Scott 4 years ago from sunny Florida

    Clever little tricks. Kids like to use these to solve problems. Thank you for sharing this. ps

  • joanwz profile image

    Joan Whetzel 4 years ago from Katy, Texas

    cool trick.

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