Measures and time · Ages 7–8

Estimating lengths worksheet

Part of: Metres and centimetres

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Measures and time · Ages 7–8

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Write each answer in the space. For word problems, show your working and write a sentence answer.

1.A hand is about 10 cm wide. A desk is about 5 hands wide. About how wide is the desk in centimetres?
Answer:
2.A hand is about 10 cm wide. A desk is about 9 hands wide. About how wide is the desk in centimetres?
Answer:
3.A hand is about 10 cm wide. A desk is about 6 hands wide. About how wide is the desk in centimetres?
Answer:
4.Each of Tsz-hin's steps is about 50 cm. Tsz-hin walks 18 steps from the door to the window. About how many metres is that?
Answer:
5.Each of Chi-keung's steps is about 50 cm. Chi-keung walks 8 steps from the door to the window. About how many metres is that?
Answer:
6.Each of Ka-yan's steps is about 50 cm. Ka-yan walks 8 steps from the door to the window. About how many metres is that?
Answer:

7.About how long is 🍌?
- A. 190 cm
- B. 19 m
- C. 190 m
- D. 19 cm
Choose the right answer
Answer:
8.About how long is 📏?
- A. 20 cm
- B. 200 cm
- C. 20 m
- D. 200 m
Choose the right answer
Answer:
9.About how long (or tall) is 🚌?
- A. 110 m
- B. 1 m
- C. 11 m
- D. 11 cm
Choose the right answer
Answer:
10.About how long (or tall) is 🚗?
- A. 50 m
- B. 5 m
- C. 1 m
- D. 5 cm
Choose the right answer
Answer:
11.Each of Tsz-hin's steps is about 50 cm. After 16 steps, Tsz-hin has walked about 16 m.
True or false?
Answer:
12.Each of Ming's steps is about 50 cm. After 16 steps, Ming has walked about 16 m.
True or false?
Answer:

13.May's arms stretched wide are about 1 m. May measures a corridor with them 3 times. About how long is the corridor in metres?
Working:
Answer:
14.A floor tile is about 50 cm along each side. A row has 16 of these tiles. About how long is the row in metres?
Working:
Answer:
15.A finger is about 1 cm wide and a hand about 10 cm. Chi-keung finds a card is about 8 fingers wide and a book about 5 hands wide. About how much wider is the book, in centimetres?
Working:
Answer:
16.Ka-lok's arms stretched wide are about 1 m. Ka-lok measures a corridor with them 8 times. About how long is the corridor in metres?
Working:
Answer:
17.A finger is about 1 cm wide and a hand about 10 cm. Chi-keung finds a card is about 8 fingers wide and a book about 4 hands wide. About how much wider is the book, in centimetres?
Working:
Answer:
18.A floor tile is about 50 cm along each side. A row has 20 of these tiles. About how long is the row in metres?
Working:
Answer:

Show the answers and working

Estimating lengths worksheet: Answers and working

1. 50 cm
Each hand is about 10 cm wide, so 5 hands are 5 lots of 10 cm.
5 lots of 10 cm: about 50 cm.
2. 90 cm
Each hand is about 10 cm wide, so 9 hands are 9 lots of 10 cm.
9 lots of 10 cm: about 90 cm.
3. 60 cm
Each hand is about 10 cm wide, so 6 hands are 6 lots of 10 cm.
6 lots of 10 cm: about 60 cm.
4. 9 m
A step is about 50 cm. How far are two steps? How many metres is that?
Two steps are about 100 cm, 1 m; 18 steps are 9 pairs: about 9 m.
5. 4 m
A step is about 50 cm. How far are two steps? How many metres is that?
Two steps are about 100 cm, 1 m; 8 steps are 4 pairs: about 4 m.
6. 4 m
A step is about 50 cm. How far are two steps? How many metres is that?
Two steps are about 100 cm, 1 m; 8 steps are 4 pairs: about 4 m.

7. D. 19 cm
Compare with something you know: a ruler is about 30 cm. Is 🍌 longer or shorter than a ruler?
Compare with what you know: a ruler is about 30 cm, so 🍌 is about 19 cm.
8. A. 20 cm
Compare with something you know: a ruler is about 30 cm. Is 📏 longer or shorter than a ruler?
Compare with what you know: a ruler is about 30 cm, so 📏 is about 20 cm.
9. C. 11 m
Arms stretched wide are about 1 m. About how many of those would 🚌 be?
Arms wide are about 1 m, and 🚌 is about 11 of those: 11 m.
10. B. 5 m
Arms stretched wide are about 1 m. About how many of those would 🚗 be?
Arms wide are about 1 m, and 🚗 is about 5 of those: 5 m.
11. False
About how far are two steps, in metres? How many pairs of steps are in 16? Then compare with 16 m.
Two steps make about 1 m, so 16 steps are about 8 m.
12. False
About how far are two steps, in metres? How many pairs of steps are in 16? Then compare with 16 m.
Two steps make about 1 m, so 16 steps are about 8 m.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 3 m
Each stretch is about 1 m, and May measured 3 times.
About 1 m each time, so about 3 m.
14. 8 m
Each tile is about 50 cm. How long are two tiles? How many pairs of tiles are in 16?
Two tiles are about 1 m, so 16 are about 8 m.
15. 42 cm
Estimate each first: about how many cm wide is the card? The book is about 5 lots of 10 cm. Then compare.
The book is about 50 cm and the card about 8 cm: 50 − 8 = 42.
16. 8 m
Each stretch is about 1 m, and Ka-lok measured 8 times.
About 1 m each time, so about 8 m.
17. 32 cm
Estimate each first: about how many cm wide is the card? The book is about 4 lots of 10 cm. Then compare.
The book is about 40 cm and the card about 8 cm: 40 − 8 = 32.
18. 10 m
Each tile is about 50 cm. How long are two tiles? How many pairs of tiles are in 20?
Two tiles are about 1 m, so 20 are about 10 m.

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