**Look at the following equations:**

**1. 70 x 4=280**

**2. 70 x 40=2,800**

**3. 700 x 4=2,800**

**4. 700 x 40=28,000**

**5. 7,000 x 40=280,000**

**What can we learn from the above equations?**

**All the equations have four numbers in common: 7 , 4 , their products, 28 and 0’s. **

**Here is the trick: when you try to get the answer of 7,000 x 40, you only need to take two steps:**

**First: Find the product of 7 and 4, which is 28;**

**Secondly: count the number of 0’s in both 7,000 and 40, which is 4; put the four 0’s after 28. **

**Therefore, the product of 7,000 and 40 is 280,000**

**The last thing that you want to do is to multiply 0’s by 0’s in the numbers. **

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