Is there any trick to quickly multiply numbers ending in 0 - like 280 x 20?
Multiply the counting numbers. Then add the same number of zeroes as there are in the problem.
28 * 2 = 56
280 * 20 - 5600
Awesome! Thank you :)
You're welcome.
Yes, there is a trick to quickly multiply numbers ending in 0. When multiplying a number ending in 0 by another number, you can ignore the 0 and multiply the remaining digits first. Then, to determine the number of zeros in the product, you simply count the total number of zeros from the two original numbers.
In the case of multiplying 280 by 20, you can ignore the 0's and multiply 28 by 2, which equals 56. Since there are three zeros in the original numbers (one from 280 and two from 20), the product will have three zeros as well. Therefore, the result is 5,600.
The general steps to multiply numbers ending in 0 are:
1. Ignore the zeros and multiply the remaining digits together.
2. Count the total number of zeros from the two original numbers.
3. Append the counted zeros to the product from the previous step to get the final answer.
This trick saves time by reducing the number of multiplications needed.