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

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

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.

Add meters → 450 m + 650 m = 1100 m = 1 km 100 m

Add kilometers → 3 km + 4 km + 1 km = 8 km

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

 46 m 25 cm.

• Make meters same → 63 m = 62 m 100 cm
• Now subtract:
  62 m 100 cm − 16 m 75 cm = 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

Find the difference between 6 km 1,480 m and 7 km 479 m.

Convert to metres:

6 km 1,480 m = 7,480 m
7 km 479 m = 7,479 m

Difference = 1 m

Convert 9,108 cm into metres and centimetres.

9,108 cm = 91 m 8 cm

Arrange in increasing order:
450 m, 2 km, 1,200 m, 3 km

Convert all distances to the same unit (metres):

2 km = 2,000 m
3 km = 3,000 m

Now compare:

450 m, 1,200 m, 2,000 m, 3,000 m