Rounding Numbers

1
Rounding Numbers
660
630
600
700
74
77
70
80
2
The Rule

• Look at the number to the right of the rounding
  number. If that number is 0, 1, 2, 3, or 4, do
  not change the rounding number. All the numbers
  on the right side of the rounding number will
  become 0.

3

• Round 64 to the nearest 10.

Look at the number to the right of the tens place.
Since the number is 4, leave the 6 as it is and
change the 4 to 0.
60
4
The Rule

• If the number to the right of the rounding number
  is 5, 6, 7, 8, or 9, the rounding number rounds
  up one number. All the numbers to the right of
  the rounding number become 0.

5

• Round 270 to the nearest 100.

Look at the number to the right of the hundreds
place.
Since the number is 7, round up the 2 and make it
3. Then make the other two numbers 0.
300
6
Rounding to the Nearest 10
65
64
66
63
67
62
68
61
69
70
60
7
Rounding to the Nearest 100
350
340
360
330
370
320
380
310
390
400
300
8
Now its your turn!
9
Round 37 to the nearest 10.

1. 30
2. 40
3. 35
4. 25

1 2 3 4 5
10
Round 23 to the nearest 10.

1. 20
2. 25
3. 30
4. 35

1 2 3 4 5
11
Round 670 to the nearest 100.

1. 500
2. 600
3. 650
4. 700

1 2 3 4 5
12
Round 734 to the nearest 100.

1. 600
2. 750
3. 800
4. 700

1 2 3 4 5
13
28 students are in Mrs. Smiths class. About how
many students are in her class?

1. 20
2. 30
3. 40
4. 50

1 2 3 4 5
14
There are 132 pencils in the box. About how many
pencils are in the box?

1. 100
2. 200
3. 300
4. 50

1 2 3 4 5