# MATH

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IS THERE AN EASY WAY TO MULTIPLY TRIPLE DIGITS BY DOUBLE DIGITS?

• MATH -

* Place one number above the other so that the hundreds', tens' and ones' places are lined up. Draw a line under the bottom number.

529
67

* Multiply the two numbers in the ones' places. (9 * 7 = 63). This number is larger than 9 so place a 6 above the tens' place column and place 3 below the line in the ones' place column.

6
529
67
3

* Muliply the digit in the top tens' place column (2) by the digit in the lower ones' place column (7). The answer (2*7=14) is added to the 6 above the top tens' place column to give an answer of 20. The 0 of 20 is placed below the line and the 2 of the 20 is placed above the hundreds' place column.

26
529
67
03

* The hundreds' place of the top number (5) is multiplied by the ones' place of the multiplier (5*7=35). The two that was previously carried to the hundreds' place is added and the 37 is placed below the line.

26
529
67
3703

* After 529 has been multiplied by 7 as shown above, 529 is multiplied by the tens' place of the multiplier which is 6. The number is moved one place to the left because we are multiplying by a tens' place number. The result would be 3174:

15
529
67
3703
3174

* A line is drawn under the lower product (3174) and the products are added together to get the final answer of 35443.

15
529
67
3703
3174
35443

• MATH -

Ha!
Horizontal rules didn't copy and spaces removed... Last one looks like this; the rest should be obvious from it:

15
529 *
_67 *
-----
_3703
3174
-----
35443

• MATH -

http://www.aaamath.com/

Here's a good math website. From here, go to Multiplication in the list on the left; then scroll down to where you see two- and three-digit numbers being multiplied.

=)

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