Division Trick: Divide by 5 Quickly

 

Introduction

Dividing by 5 can be done mentally without long division. This simple trick is useful for quick calculations.

The Trick

To divide a number by 5:

  1. Multiply the number by 2.

  2. Move the decimal point one place left.

Formula

Number ÷ 5

= (Number × 2) ÷ 10

Example 1

20 ÷ 5

Step 1:

20 × 2 = 40

Step 2:

40 ÷ 10 = 4

Answer

4

Example 2

35 ÷ 5

Step 1:

35 × 2 = 70

Step 2:

70 ÷ 10 = 7

Answer

7

Example 3

125 ÷ 5

Step 1:

125 × 2 = 250

Step 2:

250 ÷ 10 = 25

Answer

25

Example 4

240 ÷ 5

Step 1:

240 × 2 = 480

Step 2:

480 ÷ 10 = 48

Answer

48

Example 5

375 ÷ 5

Step 1:

375 × 2 = 750

Step 2:

750 ÷ 10 = 75

Answer

75

Practice Questions

  1. 45 ÷ 5

  2. 90 ÷ 5

  3. 155 ÷ 5

  4. 320 ÷ 5

  5. 405 ÷ 5

Answers

  1. 9

  2. 18

  3. 31

  4. 64

  5. 81

Key Learning

Dividing by 5 is the same as multiplying by 2 and then dividing by 10.

This shortcut is often faster than traditional division.

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