Every time this post is displayed a new set of questions about number bonds of 9 will be randomly generated in the table below.
Note there may be some duplicates, that can happen with random numbers. It doesn’t hurt to ask the same question more than once so you can check you get the same answer each time.
What are number bonds?
This post explains number bonds in more detail but basically the number bonds of a particular number are all the pairs of smaller numbers that add up to that number. The questions in the table below should make things clear.
The worksheets use the following alternatives for adding
 +
 plus
 add
 and
and the following alternatives for subtracting
 –
 minus
 subtract
 takeaway
 less
Number bounds of 9
?

and

3

=

9

9

subtract

4

=

?

9

+

?

=

9

9

takeaway

7

=

?

?

+

7

=

9

9

subtract

?

=

4

9

–

4

=

?

9

plus

?

=

9

9

subtract

?

=

5

9

less

3

=

?

9

takeaway

?

=

6

9

subtract

?

=

8

9

minus

?

=

7

5

plus

?

=

9

9

–

4

=

?

Number Bonds Worksheets Spreadsheet
Here is an Excel spreadsheet which will generate Number Bonds Worksheets
There are separate posts for number bonds of 9, 10 and 20 but all link to the same spreadsheet which has 3 worksheets in it.
Why Bother To Learn Number Bonds Of 9?
It is particularly useful to learn the number bonds of 9 as it just so happens for every number in the 9 times table the digits (the numbers in the different columns) always add up to 9. Though for 99 you have to add twice (9 + 9 = 18, 1 + 8 = 9)
This gives an easy way to work out the answers to the 9 times tables from 9 × 2 to 9 × 9
 Find 10 times
 Make the tens column of the answer one smaller
 Put the number bond of 9 in the units column
For example 9 7
 10 × 7 = 70
 70 changes to 60
 The 6 + 3 = 9 so the answer is 63
Note it is easier to work out 9 ×10 and 9 × 11 from 10 and 11 times tables
9 × 10 – write a 0 after the 9 – so 9 × 10 = 90
9 × 9 – write the 9 down twice – so 9 × 11 = 99