Multiply numbers ending in zeroes
When you multiply two numbers with any of them having ending zeroes, you can do this:
| Step 1. |
Count the number of zeroes that are there at the end of both numbers. Say there are 3 all together. |
| Step 2. |
Remove them from both numbers. |
| Step 3. |
Look at the remaining two numbers. |
| Step 4. |
Multiply those numbers |
| Step 5. |
Now put back the combined number of removed zeroes at the end of the answer in step 4 |
Take the following multiplication 20x700
Now let's see how each of the above steps apply
- Count the number of zeroes that are there at the end of both numbers. 3 all together One in 20 and two in 700. Together they make three.
- Remove them from both numbers. 2 x 7
- Look at the remaining two numbers. 2 and 7
- Multiply those numbers 2 x 7 = 14
- Now put back the combined number of removed zeroes at the end of the answer in step 4. 14000. See how the 3 zeroes are added to 14 making 14,000.
