( It's just like Multiplying Decimals, but it's opposite) Topic 7

Dividing Decimals One Way you can do this is by rounding each number to the greatest place that has a non-

zero digit.

Ex: 269.95 divided by 23 can be

rounded to 300 divided by 20

= 15

Another Way you can do this is

by using compatible numbers

you can divide in your head.

Ex: 269.95 divided by 23 can

be rounded to 275 divided by

25 = 11 7-3

Estimation: Decimals

Divided by Whole Numbers Write the decimal point in the quotient

directly above the decimal point

in the dividend.

Then you divide the decimal the same

way you would divide a whole number

Ex: 42.45 divided by 3 = 14.15 7-2

Dividing a Decimal

by a Whole Number The quotient of a number divided by 10,100,or 1,000 is less than the number.

Moving the decimal point

in a number to the

left decreases the numbers

value.

Since place-value is based on 10, dividing by 10,100,or 1,000 gives the same result as moving the decimal point 1,2,or 3 places.

Ex: 12.5 divided by 10 = 1.25

12.5 divided by 100 = 0.125

12.5 divided by 1,000 = 0.0125 7-1

Dividing Decimals by

10,100,or 1,000 7-4

Dividing a Decimal

by a Decimal Multiply the divisor by a

power of 10 to make it a

whole number. Ex: 0.84 x 100 = 84

Multiply the dividend by

the same power of 10. Ex: 3.99 x 100 = 399

Place the decimal point in the quotient. Divide as you would with whole numbers. So, 3.99 divided by 0.84 = 4.75 Presentation

by:

Corey

Sehee

Ella Quick Quiz What is 16.4 divided by 10 1.64 16.4 divided by 10

16.4 move 1 place to the left because

it has 1 zero in the 10. So the answer is: The quotient should be LESS than the

dividend. 27.5 divided by 100

Move the decimal 2 places to the left. What is 27.5 divided by 100? 0.275

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