Metric Magic
A scientist needs 5 litres (L) of a chemical. If they only have a 250 milliletre (mL) scoop, how many scoops do they need?
20 scoops
(5 L = 5,000 mL)
250mL x 20 = 5,000mL
A cyclist travels at a steady speed of 20 kilometres (km) per hour. How many kilometres (km) will they travel in 3 hours?
60 kilometres (km)
20km x 3 = 60km
A triangle has a base of 20 metres (m) and a height of 6 metres (m). What is its area?
60 square metres (m2)
20 x 6 = 120
120 divided by 2 = 60m2
A fence is 400 centimetres (cm) long. How many millimetres (mm) is this?
4,000 millimetres (mm)
A rectangular floor has an area of 40 square metres (m2). If the length is 8 metres (m), what is the width in centimetres (cm)?
500 centimetres (cm)
8m x 5m = 40m2
5m = 500cm
Using 3 as the value for pi, what is the area of a circle with a radius (r) of 4 centimetres (cm)?
Hint: A = pi x r2
48 square centimetres (cm2)
r2 = 4 x 4 = 16
16 x 3 = 48cm2
A heavy box has a mass of 12 kilograms (kg). If it is split into 4 equal smaller boxes, what is the mass of one small box in grams (g)?
3,000 grams (g)
12kg = 12,000g
3,000g x 4 = 12,000g
A large jug holds 6 litres (L) of juice. If you fill 15 cups equally from the jug, how many milliletres (mm) are in each cup?
400 milliletres (mm)
6L = 6,000mL
400mL x 15 = 6,000mL
A rectangular classroom is 12 metres (m) long and 9 metres (m) wide. What is the total area of the classroom?
108 square metres (m2)
12 x 9 = 108
A bookshelf is 2 metres (m) tall. If each book is 40 millimetres (mm) thick, how many books can be stacked to reach the top?
50 books
2m = 2,000mm
40mm x 50 = 2,000mm
A square map has an area of 100 square centimetres (cm2). If the scale is 1cm=5km, what is the actual length of one side of the map in kilometres (km)?
50 kilometres (km)
10cm x 10cm = 100cm2
If 1cm=5km, then 10cm = 50km
A rectangular photo is 10 centimetres (cm) by 8 centimetres (cm). If you cut a square hole out of the middle that is 2cm by 2cm, what is the area of the photo that is left?
76 square centimetres (cm2)
10 x 8 = 80
2 x 2 = 4
80 - 4 = 76
A runner complets a 10-kilometre (km) race. If they run 2,000 metres (m) every 10 minutes, how many minutes did the whole race take?
10km = 10,000m
2,000m x 50 = 10,000m
A candle is 30 centimetres (cm) tall. It burns down at a rate of 5 millimetres (mm) per minute. How many minutes will it take for the candle to burn out completely?
60 minutes (1 hour)
30 cm = 300 mm
5mm x 60 = 300mm
A large rectangular playground is 50 metres (m) long. If the total area is 1,000 square metres (m2), what is the width of the playground?
20 metres
50 x 20 = 1,000