Missing Numbers
2 + 3 = 4 + 1. Can you see how both sides of the sum balance? Just like people on a seesaw.

Missing Numbers

This Math quiz is called 'Missing Numbers' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is a fun way to learn if you are in the 1st or 2nd grade - aged 6 to 8.

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Finding the missing number in a number sentence such as 7 = ? - 9 will require an understanding of the symbols used and what they mean, as well as an understanding of how subtraction and addition work and how they are related to each other. To find the missing number in the above sentence, for example, understanding that '=' means 'is the same as' should help to work out that 16 - 9 gives an answer of 7.

Can you find the missing numbers?

1.
Which number is missing:
2 + 3 + 6 = 19 - ?
19
9
11
8
19 - 8 gives 11, which is what the other numbers add up to
2.
Which number is missing:
15 - 11 = 2 + ?
2
3
4
5
Make sure both calculations give the same answer
3.
Which number is missing:
18 = 4 + 6 + ?
6
17
8
15
8 must be added to 4 and 6 to get 18
4.
Which number is missing:
8 - ? = 2
2
8
4
6
Using fingers might be useful
5.
Which number is missing:
20 - 4 = 12 + ?
4
6
12
20
Balancing the two number sentences to give the same answer is the key here
6.
Which number is missing:
5 = 19 - ?
14
13
12
11
5 is equal to 19 - 14
7.
Which number is missing:
8 = ? + 5
2
3
5
8
Working out which two numbers add together to make 8 is helpful here
8.
Which number is missing:
20 - ? = 5 + 5 + 5 + 5
1
0
2
20
5 + 5 + 5 + 5 = 20, so nothing needs to be subtracted from the other side
9.
Which number is missing:
20 = 17 + ?
6
5
4
3
Knowing number bonds to 20 might be helpful here!
10.
Which number is missing:
3 + 4 = 10 - ?
4
3
7
10
This question is all about balancing both sides evenly
Author:  Angela Smith

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