Multiplying and Dividing by 9 and 11
WALT: To multiply and divide by 9 and 11.
Multiply by 9, using x 10 to help you.
Now try it with larger numbers, but for each
one I’d like you to write the inverse operation
too.
6x9
6 x 10 = 60
- 6
_____
54
So, 6 x 9 = 54
For example: 13 x 9 = 117
117 ÷ 9 = 13
1) 15 x 9
2) 18 x 9
3) 23 x 9
4) 26 x 9
5) 28 x 9
6) 32 x 9
7) 35 x 9
8) 39 x 9
We can also use x 10 to help us multiply by 11.
Try multiply these numbers by 11 and remember to
Write the inverse operation.
For example: 14 x 11 = 154
154 ÷ 11 = 14
6 x 11
6 x 10 = 60
+ 6
_____
66
So, 6 x 11 = 66
9) 16 x 11
9) 18 x 11
10) 22 x 11
11) 25 x 11
12) 29 x 11
13) 33 x 11
14) 36 x 11
15) 41 x 11