ROUNDING NUMBERS

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 less than five, do not change, let rest. 2.532 2.53 If the digit to the immediate right of the last sig fig is greater than five, round up the last sig fig. 2.536 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 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. 51 52 53 54 55 56 57 58 59 Odd….round up 2.5350 2.54 If it is an even digit, do not round it up; leave it! 2.5250 2.52 Even….leave it 2.5349 2.53

Example: 81.889(three) 81.9

Example: 65.824(three) 65.8

Example: 843 (two) 84 840

Example: 3,381 (two) 3,400 34

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

WHITEBOARD PRACTICE

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