The commutative property tells us that changing the order of the factors in a multiplication sentence does not change the product.
Commutative Property
A multiplication sentence can be written horizontally or vertically as shown below:
Annexing Zeroes
Annexing zeros is a quick way of multiplying by 10, 100, 1,000, and so on. Count the number of zeros in the first factor. Then place that amount of zeros at the end of the product.
Multiplication is a short way of adding or counting numbers.
Just for Practice
A Closer Look
Some Helpful Tools
The last zero in the first partial product 100 is placed in the ones place because the factor 4 is in the ones place.
The last zero in the second partial product 50 is placed in the tens place because the factor 2 is in the tens place.
When multiplying triple-digit factors, the last digit in the third partial product is placed in the hundreds place, and so on.
Note:
Math: Multiplication - Tutorial
