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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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