I will use the standard algorithm to divide decimals.

1
I will use the standard algorithm to divide
decimals.
L22 Dividing Decimals
I will be able to find the quotient in 4 of 5
classwork problems.
2
Food for thought

• Suppose you have 10.40 and you want to buy as
  many 0.65 spider rings as possible.
• How can you figure out how many spider rings you
  can buy?

3
Remember the parts of a division problem
Quotient answer
9
5
45
Dividend The amount that you want to divide up.
Divisor The number you divide by
4
Dividing a Decimal by a Whole Number

• Place the decimal point in the quotient directly
  above the decimal point in the dividend.
• Divide as you normally would (DMSCB)

5
Example 1
DMSCB
.
2
5
5
12.5
10
2
5
25
0
6
Dividing a Decimal by a Decimal

1. Move the decimal point in the divisor to the
   right, until you get to the end of the digits.
2. Count how many places you moved that decimal.
3. Move the decimal point in the dividend the same
   number of places to the right.

7
Example 2
0.3
6.72
one space
03
67.2
New problem
8
Example 2
Solve
.
2
2
4
DMSCB
3
67.2
6
0
7
6
1
2
1 2
0
9
Example 3
0.38
13.3
The decimal must be moved 2 spaces to the right.
When we move this one 2 spaces, we find that we
need to add a space. What will we fill it with?
Answer Fill it in with a 0. 13.3 becomes 1330
SO, our problem becomes 038 into 1330. 038 is the
same as 38.
10
3
5.
Example 3
38.
1330.
Find quotient and share answer with a shoulder
buddy.
114
19
0
190
0
11
I will use the standard algorithm to divide
decimals.
Reflect fist to 5
Assess
I will be able to find the quotient in 4 of 5
classwork problems.
12
Classwork

1. 17.4 3
2. 100.38 21
3. 3.14 0.2
4. 0.816 0.68
5. Suppose you have 10.40 and you want to buy as
   many 0.65 spider rings as possible.

13
The Basics

• When you multiply by 10, 100, or 1,000, you can
  move the decimal point to the right.
• The number of decimal places you move is the same
  as the number of zeroes you are multiplying by.
• When you divide by 10, 100, or 1,000, you can
  move the decimal point to the left. Move the
  decimal point once for each zero you are dividing
  by.

14
1.492 x 100
Move the decimal to the right two spaces.
149.2
15
2,124.94 1,000
Move the decimal to the left three spaces.
2.12494
16
4.2 100
Move the decimal point to the left two spaces.
Add a zero for the second space.
.042
17
15.36 x 1,000
Move the decimal point to the right three
spaces. Add a zero for the third space.
15,360