MATHS

Number


Pull apart this number using place value


Round to nearest 10th


Round to nearest whole number (1)


Write as a fraction


Write as a percentage


Double of this number


Half of this number


20% of this number


This number x10



1.45


1 whole, 4 tenths and 5 hundredths


1.5


1


145/100


145%


2.90


0.725


0.435


14.5



0.32


0 whole, 3 tenths 2 hundredths


0.3


0


32/100


32%


0.64


0.32/2=16









0.99


0 whole, 9 tenths 9 hundredths


1


1


99/100


99%


1.98


0.99/2=49.9









0.567


0 whole, 5 tenths 6 hundredths and 7 thousandths


0.6


1


56.7/100


56.7%


113.4


0.567/2=









1.25


1 whole 2 tenths and 5 hundredths


1.3


1


1.25/100


1.25%


2.5


1.25/2=









2.33


2 ones, 3 tenths and 3 hundredths


2.3


2


2.33/100


1.33%


2.66













Finding fractions (answer might be a whole number of a decimal)


⅓ of 10 = 10÷3 = 3.33


⅘ of 50 50 ÷ 5 x 4 = 20


1 ½ of 10 = 10x1.5=15


⅔ of 180 = 180÷3x2=120


⅕ of 1000 = 1000÷5=200


¾ of 100 = 100÷4x3=75


⅔ of 900 = 900÷3x2=600


⅘ of 450 = 450÷5x4=360


7/10 of 70 = 70÷10x7=49


4/6 of 60 = 60÷6x4=40



Finding percentages


18/20 as a percentage = 18/20x100 = 90


42/50 as a percentage =42/50 x 100= 84


32/35 as a percentage = 32÷35x100=91.42


20/30 as a percentage = 20÷30x100=66.66


3/15 as a percentage = 3÷15x100=20


20% of 30 =


40% of 50 = 50÷100x40=20


80% of 80 = 80÷100x80=64


30% of 15 = 15÷100x30=4.5


75% of 40 = 40÷100x75=30



Finding decimals


1.5+1.5=3


8-1.4 =6.6


5-1.32=3.64


6-1.43=4.57


1-0.095=0.905



Word problems


There are 6 students in Room 4. The other three-quarters of the students in the school are in Rooms 1,2 and 3. How many students are in Rooms 1, 2 and 3?18


Using a typing test, Miss Ashley correctly typed 20 words in 25.41 seconds. The next day, she typed 20 words in 24.98 seconds. How much faster did she get?0.43


During the rugby tournament, Leon drank 1.2 litres of water and other juice. On a normal day back at school, he only drinks 0.345ml of water. How much extra water did he have on the day of the tournament?0.855


Miss Ashley had the idea to sew masks for the kids when they come back to school. Each mask takes 0.33m of fabric to make. She has 8m of fabric. Does she have enough to make one mask each for her 26 students?


Bonus: If she doesn't have enough, how much more fabric would she need?


If you buy 1 litre of juice, it costs $1.50. If you buy the 5 litre bottle, it costs $5.99. If you want 10 litre of juice for a party, which should you buy and why?