Addition and subtraction · Ages 6–7

Zero worksheet

Part of: Addition and subtraction within 18

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Addition and subtraction · 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.

13.Ka-yan has 15 stamps and gives them all away to friends. How many does Ka-yan have left?
Working:
Answer:
14.A car park has 8 cars. All 8 drive away, then 8 drive in. How many cars are in the car park now?
Working:
Answer:
15.There are 2 people in a lift. At the next floor nobody gets out and nobody gets in. How many people are in the lift now?
Working:
Answer:
16.The first box has 11 egg tarts; the second box is empty. How many are there in the two boxes?
Working:
Answer:
17.The first box has 3 apples; the second box is empty. How many are there in the two boxes?
Working:
Answer:
18.There are 13 people in a lift. At the next floor nobody gets out and nobody gets in. How many people are in the lift now?
Working:
Answer:

Show the answers and working

Zero worksheet: Answers and working

1. 0
Subtracting the number itself means taking all of them. How many are left?
All of them subtracted leaves none: 0.
2. 16
One of the numbers is 0. Adding 0 means adding nothing at all.
Adding 0 adds nothing, so the answer stays 16.
3. 3
One of the numbers is 0. Adding 0 means adding nothing at all.
Adding 0 adds nothing, so the answer stays 3.
4. 0
Subtracting the number itself means taking all of them. How many are left?
All of them subtracted leaves none: 0.
5. 0
After taking some away, the amount hasn't changed at all. So how many were taken?
Still 11 afterwards, so nothing was taken: □ is 0.
6. 15
Subtracting 15 leaves none at all. How many must there have been to begin with?
Taking 15 leaves none, so there were exactly 15.
7. 11
Subtracting 11 leaves none at all. How many must there have been to begin with?
Taking 11 leaves none, so there were exactly 11.
8. 4, 4, 0
Go one at a time: does adding or subtracting 0 change anything? What does subtracting the number itself leave?
+ 0 and − 0 change nothing: 4. Minus itself: 0.
9. 2, 2, 0
Go one at a time: does adding or subtracting 0 change anything? What does subtracting the number itself leave?
+ 0 and − 0 change nothing: 2. Minus itself: 0.

10. False
First check whether the number subtracted is 12 itself. What does 12 minus 0 leave?
12 minus 0 leaves 12. Only subtracting the number itself gives 0.
11. D. 10 − 10
Go through each: does adding or subtracting 0 change anything? What about subtracting the number itself?
A number minus itself leaves none: 10 − 10 = 0.
12. False
First check whether the number subtracted is 3 itself. What does 3 minus 2 leave?
3 minus 2 leaves 1. Only subtracting the number itself gives 0.

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

13. 0 stamps
Giving them all away means all of them are taken. How many are left?
All given away: 15 − 15 = 0.
14. 8 cars
First think how many are left once every car has gone, then add the 8 that drive in.
8 − 8 = 0, and 0 + 8 = 8.
15. 2 people
Nobody gets out and nobody gets in: that is adding 0 and subtracting 0. Does the number change?
Nobody in or out: 2 + 0 − 0 = 2.
16. 11 egg tarts
An empty box has none at all. Does adding none change the number?
An empty box holds 0: 11 + 0 = 11.
17. 3 apples
An empty box has none at all. Does adding none change the number?
An empty box holds 0: 3 + 0 = 3.
18. 13 people
Nobody gets out and nobody gets in: that is adding 0 and subtracting 0. Does the number change?
Nobody in or out: 13 + 0 − 0 = 13.

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