Solution to

Normally, each group of three digits (beginning at the decimal point and

Frame 1-18

going to the left) is set off by a comma in order to make reading easier

(separate thousands from hundreds, millions from thousands, billions

6 6

from millions, etc.).

4 4

367

If the product has only four digits (less than 10,000), the comma may be

x 97

present or absent (4,500 or 4500). If the number has five or more digits,

2 5 6 9 (367x7)

include the comma(s) in the product. Numbers of three or less digits

3 3 0 3 0 (367x90)

(less than 1,000) have no commas.

3 5,5 9 9

NOTE: If the number is a decimal number (discussed in Lesson 3), the

above comments apply only to digits to the left of the decimal point.

Commas are not placed between digits located to the right of the decimal

point.

Remember to keep your columns straight. This is especially true if the

multiplier contains a zero. Also remember that the product of any

number multiplied by zero is zero.

NOTE: You may wish to remove the commas from the factors when

multiplying if that will help you to keep the columns straighter and keep

you from becoming confused.

Work this problem: 23,042 x 1,020

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Solution to

Frame 1-19

23042

25.

x 1020

46084

10

23042

25 / 250

23502840

25

00

OR

00

23 042

Notice that the number to the right of the division sign () goes outside

x 1 020

the division block.

00 000

460 840

When "250 25" is changed to 25/250, it is read as "25 *divided into*

0 000 000

23 042 000

250." Remember, when dividing, you divide into the dividend going from

23 502 840

left to right (go from large place value to smaller place value), a change

from addition, subtraction, and multiplication.

(23,502,840)

Set up this problem:

You have 156 eggs. You want to put them into egg cartons (12 eggs per

carton). How many cartons do you need?

MD0900

1-8

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