can be shown in a diagram 1 ½ 5/17 Round decimals = 1½ Rules for rounding Find the ‘round off’ digit Move one digit to its right Improper fraction Mixed number A mixed number can be changed back Is this digit 5 or more into an improper fraction Yes – add one to the round off digit No – don’t change the round off digit 1½ = To the nearest whole number e.g. 1 – To round 5.62 to the nearest whole 2¾ = ‘round off’ digit this digit is 5 or more 5/16 Multiply fractions 5.62 rounded to nearest whole = 6 Multiply is the same as repeated addition e.g. 2 – To round 5.32 to the nearest whole ‘round off’ digit this digit is NOT 5 or more 5.32 rounded to nearest whole = 5 + + To one decimal place e.g. 1 – To round 12.37 to 1 decimal place 3 2 x = + + = = ‘round off’ digit this digit is 5 or more OR 12.37 rounded to 1dp = 12.4 e.g. 2 – To round 12.32 to the nearest whole 2 x = = ‘round off’ digit this digit is NOT 5or more 12.37 rounded to 1dp = 12.3
can be shown in a diagram 1 ½ = 1½ Improper fraction Mixed number A mixed number can be changed back into an improper fraction 1½ = 2¾ = 5/16 Multiply fractions Multiply is the same as repeated addition + + x 3 = + + = = 2 OR x = = 2 5/17 Round decimals Rules for rounding Find the ‘round off’ digit Move one digit to its right Is this digit 5 or more Yes – add one to the round off digit No – don’t change the round off digit To the nearest whole number e.g. 1 – To round 5.62 to the nearest whole ‘round off’ digit this digit is 5 or more 5.62 rounded to nearest whole = 6 e.g. 2 – To round 5.32 to the nearest whole ‘round off’ digit this digit is NOT 5 or more 5.32 rounded to nearest whole = 5 To one decimal place e.g. 1 – To round 12.37 to 1 decimal place ‘round off’ digit this digit is 5 or more 12.37 rounded to 1dp = 12.4 e.g. 2 – To round 12.32 to the nearest whole ‘round off’ digit this digit is NOT 5or more 12.37 rounded to 1dp = 12.3