Numbers and place value · Ages 7–8

Estimating larger amounts worksheet

Part of: Three- and four-digit numbers

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Numbers and place value · Ages 7–8

Numsprite
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Name:Date:Score:／48

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

1.A hall's seats are in 9 rows, with about 10 seats in each row. About how many seats does the hall have?
Answer:
2.A hall's seats are in 8 rows, with about 10 seats in each row. About how many seats does the hall have?
Answer:
3.A hall's seats are in 3 rows, with about 10 seats in each row. About how many seats does the hall have?
Answer:
4.Every box in the picture holds about the same number of things. About how many are there in all the boxes?
Answer:

13.Each page of Chi-keung's album has about the same number of photos. Chi-keung counts 25 on one page, and there are 6 pages. About how many photos are in the album?
Working:
Answer:
14.A small cup holds about 20 beans. Ka-yan scoops a bowl of beans with it 9 times and the bowl is empty. About how many beans were in the bowl?
Working:
Answer:
15.A train has 4 carriages with about 100 people in each. About how many people are on the train?
- A. 4000
- B. 104
- C. 100
- D. 400
Choose the right answer
Working:
Answer:
16.A train has 9 carriages with about 100 people in each. About how many people are on the train?
- A. 900
- B. 9000
- C. 109
- D. 100
Choose the right answer
Working:
Answer:
17.A small cup holds about 25 beans. Chi-keung scoops a bowl of beans with it 6 times and the bowl is empty. About how many beans were in the bowl?
Working:
Answer:
18.Each page of Ka-yan's album has about the same number of photos. Ka-yan counts 10 on one page, and there are 7 pages. About how many photos are in the album?
Working:
Answer:

Show the answers and working

Estimating larger amounts worksheet: Answers and working

1. 90 seats
About 10 a row and 9 rows. Count in tens 9 times.
About 10 a row; counting in tens 9 times: about 90 seats.
2. 80 seats
About 10 a row and 8 rows. Count in tens 8 times.
About 10 a row; counting in tens 8 times: about 80 seats.
3. 30 seats
About 10 a row and 3 rows. Count in tens 3 times.
About 10 a row; counting in tens 3 times: about 30 seats.
4. 44
Count the first box, count the boxes, then add the first box's amount that many times.
The first box has 22; there are 2 boxes, so add 22 2 times: about 44.

5. D. 45
Count roughly how many are in the first box, then count how many boxes there are.
The first box has 15 and there are 3 boxes: about 3 lots of 15, 45.
6. C. 200
The big jar is like 4 small jars of about 50 each. How many times do you add 50?
The big jar is about 4 small jars of about 50: about 200.
7. C. 120
The big jar is like 6 small jars of about 20 each. How many times do you add 20?
The big jar is about 6 small jars of about 20: about 120.
8. D. 450
The big jar is like 9 small jars of about 50 each. How many times do you add 50?
The big jar is about 9 small jars of about 50: about 450.
9. D. 30
There are 10 to a row. Count the rows, then see how full the last row is.
10 in a row: count the rows and look at the last one: about 30.
10. D. 50
There are 10 to a row. Count the rows, then see how full the last row is.
10 in a row: count the rows and look at the last one: about 50.
11. C. 100
There are 10 to a row. Count the rows, then see how full the last row is.
10 in a row: count the rows and look at the last one: about 100.
12. A. 80
There are 10 to a row. Count the rows, then see how full the last row is.
10 in a row: count the rows and look at the last one: about 80.

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

13. 150 photos
About 25 on each page and 6 pages. Count in 25s, 6 times.
6 pages of about 25: count in 25s 6 times, about 150.
14. 180 beans
About 20 beans a cup, 9 scoops. Count in 20s, 9 times.
9 cups of about 20: about 180.
15. D. 400
About 100 people a carriage and 4 carriages. Count in 100s, 4 times.
Count in 100s, 4 times: about 400.
16. A. 900
About 100 people a carriage and 9 carriages. Count in 100s, 9 times.
Count in 100s, 9 times: about 900.
17. 150 beans
About 25 beans a cup, 6 scoops. Count in 25s, 6 times.
6 cups of about 25: about 150.
18. 70 photos
About 10 on each page and 7 pages. Count in 10s, 7 times.
7 pages of about 10: count in 10s 7 times, about 70.

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