Writing conversions as decimals

Mathematics · Measurement · ages 10-11

Name ______________________ Date ____________

Convert 4,500 g to kilograms.
Answer: ______________
Which equals 5,120 grams in kilograms?
- 51.2 kg
- 0.512 kg
- 5.12 kg
- 512 kg
1,000 g = 1 kg. What is 4,750 g written in kilograms?
- 4.75 kg
- 47.5 kg
- 0.475 kg
1 m is the same as 1,000 mm.
Circle one: True False
Convert 2.5 km to metres.
Answer: ______________
Which unit is 100 times bigger than a centimeter?
- Millimeter
- Meter
- Kilometer
Which equals 0.65 km in metres?
- 65 m
- 6,500 m
- 6.5 m
- 650 m
Dan converts 0.72 km to metres and writes 7,200 m. Is Dan right?
Circle one: True False
Zara converts 4,500 g to kilograms and writes 45 kg. What mistake did she make?
- She divided by 100 instead of 1,000
- She multiplied instead of dividing
- She used the wrong unit name
Which shows the correct power of 10 chain?
- 100 mm = 1 cm, 10 cm = 1 m, 100 m = 1 km
- 10 mm = 1 cm, 100 cm = 1 m, 1,000 m = 1 km
- 10 mm = 1 cm, 10 cm = 1 m, 10 m = 1 km
- 1 mm = 10 cm, 1 cm = 100 m, 1 m = 1,000 km

Answer key

For grown-ups. Fold this page away before handing over the rest.

4.5 · The answer is 4.5 kg because 4,500 divided by 1,000 equals 4.5.
5.12 kg · 5.12 kg is correct because 1,000 g make 1 kg: 5,120 / 1,000 = 5.12.
4.75 kg · 4,750 divided by 1,000 is 4.75, so 4,750 g is 4.75 kg.
True · A millimeter is 1,000 times smaller than a meter, so 1,000 mm = 1 m.
2500 · The answer is 2,500 m because 2.5 times 1,000 equals 2,500.
Meter · 100 cm makes 1 m, so a meter is 100 times bigger than a centimeter.
650 m · 650 m is correct because 1 km holds 1,000 m: 0.65 times 1,000 = 650.
False · Dan is wrong. The correct conversion is 720 m; his answer is ten times too big.
She divided by 100 instead of 1,000 · Dividing by 1,000 gives 4.5 kg. Dividing by 100 instead gives the wrong answer, 45.
10 mm = 1 cm, 100 cm = 1 m, 1,000 m = 1 km · 10 mm = 1 cm, 100 cm = 1 m, 1,000 m = 1 km is the true chain.