FRAME 1-19.
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
____________________________________________________________________________
FRAME 1-20.
Solution to
DIVISION. The division problem "250 25 = 10" (which is read "250
Frame 1-19
divided by 25 equals 10") means that 250 contains 10 sets (groups) of
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
(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