Numbers and place value · Ages 6–7
Estimating how many worksheet
Part of: Numbers to 100
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Estimating how many worksheet
Numbers and place value · Ages 6–7
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.
Part A: Working out and filling in (2 marks each)
1.Tsz-hin lays some beans out in 4 rows of about the same length, with about 10 in each row. About how many beans are there?
Answer:
2.Ka-yan lays some beans out in 9 rows of about the same length, with about 10 in each row. About how many beans are there?
Answer:
Part B: Choose, or true or false (2 marks each)
3.Don't count them one by one; estimate. About how many 🍎 are in the picture?
- A. 5
- B. 90
- C. 60
- D. 100
Choose the right answer
Answer:
4.Don't count them one by one; estimate. About how many 🐶 are in the picture?
- A. 70
- B. 50
- C. 10
- D. 30
Choose the right answer
Answer:
5.Don't count them one by one; estimate. About how many 🍓 are in the picture?
- A. 40
- B. 100
- C. 60
- D. 80
Choose the right answer
Answer:
6.Don't count them one by one; estimate. About how many 🐶 are in the picture?
- A. 5
- B. 100
- C. 20
- D. 50
Choose the right answer
Answer:
7.Estimate: there are more than 30 🐱 in the picture.
True or false?
Answer:
8.Which picture has about 60 🍓?
- A
- B
- C
- D
Choose the right picture
Answer:
9.Estimate: there are more than 50 🍓 in the picture.
True or false?
Answer:
10.Which picture has about 50 🍓?
- A
- B
- C
- D
Choose the right picture
Answer:
11.Ming estimates there are 61 🐶 in the picture. Count them: which is true?
- A. Ming's estimate is exactly right
- B. Ming's estimate is too many
- C. Ming's estimate is too few
- D. You can't compare without counting
Choose the right answer
Answer:
12.Ka-yan estimates there are 83 ⭐ in the picture. Count them: which is true?
- A. Ka-yan's estimate is too many
- B. Ka-yan's estimate is too few
- C. Ka-yan's estimate is exactly right
- D. You can't compare without counting
Choose the right answer
Answer:
Part C: Word problems (4 marks each)
13.A jar holds 30 sweets. Ka-yan, Ka-lok and Chi-keung estimate 28, 39 and 26. What was the closest estimate?
Working:
Answer:
14.Chi-keung estimates a box has 85 marbles, then counts them and finds 81. How far off was Chi-keung's estimate?
Working:
Answer:
15.A small jar holds 10 sweets when full. Chi-keung sees that a big jar is about as big as 9 small jars. About how many sweets does the big jar hold when full?
Working:
Answer:
16.Each row in a cinema seats about 10 people. Today about 6 rows are full. About how many people are in the cinema?
Working:
Answer:
17.A jar holds 56 sweets. Chi-keung, Ka-yee and Ka-yan estimate 69, 48 and 66. What was the closest estimate?
Working:
Answer:
18.A small jar holds 10 sweets when full. Ka-yan sees that a big jar is about as big as 6 small jars. About how many sweets does the big jar hold when full?
Working:
Answer:
Show the answers and working
Estimating how many worksheet: Answers and working
Part A: Working out and filling in
1. 40 beans
About 10 a row and 4 rows. Count in tens 4 times.
About 10 a row; counting in tens 4 times: about 40.
2. 90 beans
About 10 a row and 9 rows. Count in tens 9 times.
About 10 a row; counting in tens 9 times: about 90.
Part B: Choose, or true or false
3. C. 60
About 10 to a row. See roughly how many rows there are, then count in tens.
10 to a row and about 6 rows; counting in tens: about 60, so the answer is 60.
4. D. 30
About 10 to a row. See roughly how many rows there are, then count in tens.
10 to a row and about 3 rows; counting in tens: about 30.
5. C. 60
About 10 to a row. See roughly how many rows there are, then count in tens.
10 to a row and about 6 rows; counting in tens: about 60.
6. C. 20
About 10 to a row. See roughly how many rows there are, then count in tens.
10 to a row and about 2 rows; counting in tens: about 20, so the answer is 20.
7. True
There are 10 to a row. See how many rows there are, roughly how many that is, then compare with 30.
10 to a row; look at the rows: there are 67.
8. A
About 10 to a row. How many rows is about 60? Find the picture whose rows are closest.
10 to a row: the one with about 60 is the closest.
9. True
There are 10 to a row. See how many rows there are, roughly how many that is, then compare with 50.
10 to a row; look at the rows: there are 84.
10. B
About 10 to a row. How many rows is about 50? Find the picture whose rows are closest.
10 to a row: the one with about 50 is the closest.
11. B. Ming's estimate is too many
Count exactly how many there are first, then compare with Ming's estimate of 61.
Counted one by one there are 57; then compare 61 with 57: tens first, then ones if the tens match.
12. B. Ka-yan's estimate is too few
Count exactly how many there are first, then compare with Ka-yan's estimate of 83.
Counted one by one there are 84; then compare 83 with 84: tens first, then ones if the tens match.
Part C: Word problems
Marking: 2 for the working, 1 for the answer, 1 for the sentence.
13. 28 sweets
Work out how far each of 28, 39 and 26 is from 30; the smallest gap is the closest.
See which is nearest to 30: 28.
14. 4 marbles
How far off means the bigger minus the smaller. First see which of 85 and 81 is bigger.
The bigger minus the smaller: 85 and 81 are 4 apart.
15. 90 sweets
A small jar is about 10, and the big one is like 9 small jars. Count in tens 9 times.
About 10 to a small jar, and 9 of them: count in tens 9 times, about 90.
16. 60 people
About 10 to a row and 6 rows. Count in tens 6 times.
About 10 a row; counting in tens 6 times: about 60.
17. 48 sweets
Work out how far each of 69, 48 and 66 is from 56; the smallest gap is the closest.
See which is nearest to 56: 48.
18. 60 sweets
A small jar is about 10, and the big one is like 6 small jars. Count in tens 6 times.
About 10 to a small jar, and 6 of them: count in tens 6 times, about 60.
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