In the previous post we learnt how to multiply any number from 70 to 79 by 5 in seconds.Today we are going to learn another cool trick to multiply any number from 80 to 89 by 5 in seconds.

Let us see the steps

**Step 1:** Assume the base as 80

**Step 2:** Multiply the base by 5

**Step 3:**Multiply the unit place digit by 5

**Step 4:**Add the results obtained in step 2 and step 3 to get

final answer.

Now lets consider a few examples to understand better

**Example 1:82 x 5 = ?**

**Step 1:**We assume the base as 80.

**Step 2:**Multiplying the base by 5

We get 80 x 5 = 400

**Step 3:**Multiplying the unit place digit by 5

We get 2 x 5 =10

**Step 4:**Adding results obtained in step 2 and step 3

We get 400 + 10 = 410

**Ans 82 x 5 =410**

**Example 2:87 x 5 = ?**

**Step 1:**We assume the base as 80.

**Step 2:**Multiplying the base by 5

We get 80 x 5 = 400

**Step 3:**Multiplying the unit place digit by 5

We get 7 x 5 = 35

**Step 4:**Adding results obtained in step 2 and step 3

We get 400 + 35 = 435

**Ans 87 x 5 =435**