Modual 10 Flashcards
How can proportion’s be written?
as a fraction: a c
- = -
b d
as a colon- a:b = c:d
a:b = c:d can also be expressed in multiplying. How would this be written?
a x d = b x c
3/5 can also be written as?
12/35
What is cross product?
It’s like cross cancel
write 20/25 = 4/5 as a cross product
20 x 5 = 25 x 4
100 = 100
How do you work out the missing term in proportion? e.g. 20/59 = 30/x
STEP 1: write the proportion
STEP 2: cross product e.g. 20 X x = 50 X 30
STEP 3: divide both sides e.g. divide by 20 = x = 75
What is a conversion factor? e.g. what is the CF of 2.55 and £1 = $1.5
the most logical number
e. g. CF = 60 minutes (how many minutes in an hour)
e. g. CF = $1.5 (exchange rate)
Convert 2.55 hours into minutes
CF =
- 55hours x 60 =153 min
- 55hours / 60 = 0.042 min
= 153 minutes
What do you have to do in a conversion factor question?
you have to / and x the original number by the conversion factor and pick the most logical answear
Metric Units: length
mm, cm, m, km
Metric Units: area
mm{squared}, cm{squared}, m{squared}, km{squared}
Metric Units: volume
mm{cubed}, cm{cubed}, m{cubed}, litres, ml
Metric Units: weight
g, kg, tonnes
Metric Units: speed
km/h, m/s
Imperial Units: length
inches, feet, yards, miles
Imperial Units: area
square inches, square feet, square yard, square mile
Imperial Units: v olume
cubic inches, cubic feet, gallons, pints
Imperial Units: weight
ounces, pounds, stone, tones
Imperial Units: sped
mph
