What is the relationship between metres and centimetres?

1 metre (m) is equal to 100 centimetres (cm).

If a race is 3 km long, how many metres does that equal?

A race that is 3 km long equals:

3 km = 3 × 1000 = 3000 metres

3000 metres long

Convert 2500 cm to metres.

1 metre = 100 centimetres

So,
2500 cm ÷ 100 = 25 metres 

If a mobile phone is 15 cm long, how long is it in metres?

1 metre = 100 centimetres

So,
15 cm ÷ 100 = 0.15 metres

How many millimetres are in 2.5 cm?

1 centimetre = 10 millimetres

So,
2.5 cm × 10 = 25 millimetres

Fill in the blank: The depth of a well is usually measured in ___.

Metres

True or False: 1 km is equal to 1000 m.

True.

If a piece of cloth is 1 m 80 cm, how many centimetres does it equal?

1 metre = 100 centimetres

So,
1 m 80 cm = 100 cm + 80 cm = 180 centimetres

What is the total distance if a person walks 3 km 450 m and then 4 km 650 m?

The total distance is 8 km 100 m.

What is the length of cable left if 63 m of cable is used and 16 m 75 cm is consumed?

The length of cable left is 46 m 25 cm.

If flags are placed every 50 m along a 3 km race, how many flags are needed?

Total length of race = 3 km = 3000 m

Distance between flags = 50 m

Number of flag intervals = 3000 ÷ 50 = 60

Since the first flag is placed at the start point, total number of flags = 60 + 1 = 61 flags

True or False: 1 foot is equal to 12 inches.

True.

If a road is 12 km 600 m long and completed in 6 days, how much road is laid each day?

12,600 m

Now, divide by 6 days:

2,100 m

Convert back to km and m:

2 km 100 m