Consider the following examples

**Example 1**

99 X 42 = 4158

Procedure

Step 1 Subtract 1 from 42, we get 41

Step 2 Now, Subtract 41 from 99, we get 58

Answer is 4158

**Example 2**

999x343=342657

Procedure

Step 1 343 – 1 = 342

Step 2 9-3 = 6, 9-4 = 5, 9-2 = 7

Answer is 342657

## 1 comment:

Ramneek,

Hi, I have been collecting little fascinations like this too. Do you find these little exercises grab the student's attention? Is this the case for Secondary students?

I did a podcast (a bit lame) about this on my About Page:

http://jamorgan.edublogs.org/about/

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