Rounding Numbers

1
Rounding Numbers
2
Lets Review the Rules
0
9
1
8
2
7
0
1
6
3
5
4
3
Underline place Value indicated
Draw an arrow to The number behind The
underlined number
Using the rounding Wheel, find the Circled number
Circle the number You drew an arrow to
If the number is on the 0 side, add 0 to the
underlined number
Everything to the Left of the underlined Number
stays the same
If the number is on 1, add 1 to The
underlined number
Everything to The right of the Underlined Number
becomes 0
4
Lets See An Example

• 345
• Round to the hundreds place
• Find and underline the place value.
• 345

5
Draw an arrow to the number behind the underlined
number

• 345

6
Circle the number you drew the arrow to

• 3

4
5
7
Look on the rounding wheel

• Notice that 4 is on the 0 side.
• Add 0 to the underlined number
• 3
• 0
• 3

8
Any number before the underlined number stays the
same

• 345
• We underlined the 3, so there are no numbers
  before our underlined number.

9
All numbers after the underlined number become 0

• 345
• So this means when we added 0 to the 3 our answer
  was 3. Our answer should look like this
• 300

10
Lets try another one

• 4,551
• Round to the hundreds place
• Remember the flow chart
• Underline the number in the hundreds place
• 4,551

11
Draw an arrow and circle

• 4,5

1
5
12
Where is the circled number on your rounding
wheel?

• 4,5

1
5

• The circled 5 is on the 1 side of your wheel.
• Now add 1 to the underlined 5
• 5
• 1
• 6

13
Now the underlined number has changed

• Everything to the left of the underlined number
  stays the same
• Everything to the right of the underlined number
  becomes 0
• 4,600

14
You Try One

• 56
• Round to the tens place.
• Underline place value, draw an arrow and circle
  the number behind the underlined number, find the
  circled number on your rounding wheel
• 5

6
15
What next?

• 5

6

• 6 is on the 1 side.
• Add 1 to the 5
• 5
• 1
• 6
• 4. Any numbers to the left of the underlined
  number stay
• The same. Everything after the underlined number
• Becomes a 0
• 5660