ROUNDING NUMBERS

RULES For Rounding Off Numbers

If the digit to the immediate right of the last sig fig is less than five, do not change, let rest. 2.532

If the digit to the immediate right of the last sig fig is greater than five, round up the last sig fig. 2.536

(Round the following numbers to three sig fig).

2.53

2.54

Even ….. Leave it

Odd …. Round up

RULES For Rounding Off Numbers(Round the following numbers to three sig fig).

If the digit to the immediate right of the last sig fig is equal to five and is followed by a nonzero digit, round up. 2.5351 2.54

515253545556575859

If the digit to the immediate right of the last sig fig is equal to five and is followed by a zero, look at the last sig fig. If it is odd digit, round it up.

2.5250

2.5350 2.54

2.52

2.5349

If it is an even digit, do not round it up; leave it!

Odd….round up

Even….leave it

2.53

81.889(three)

81.9

Example:

65.824(three)

65.8

Example:

843 (two)

84840

Example:

3,381 (two)

343,400

Example:

48 (one)

50

Example:

0.005026(three)

0.00503

Example:

5.7849(three)

5.78

Example:

5.7858 (three)

5.79

Example:

5.7850 (three)

5.78

Example:

5.7350 (three)

5.74

Example:

WHITEBOARD PRACTICE

889 (one)

900

Practice:

485 (two)

480

Practice:

19.848(three)

19.8

Practice:

35.624(two)

36

Practice:

88 (one)

90

Practice:

7,751 (two)

7,800

Practice:

85 (one)

80

Practice:

0.007335(three)

0.00734

Practice:

0.00008850(one)

0.00009

Practice:

0.000045098 (one)

0.00004

Practice:

0.000045258 (one)

0.00005

Practice:

75,091 (one)

80,000

Practice: