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Here are two fun and amazing ways to look at multiplying by nine's.
With both of these suggestions, the idea is for your son to have tools to enable him to learn the 9's painlessly and, with continued practice, know his multiplication by 9's automatically.
Your child is going to use his hands as a calculator! He must have a working understanding of tens and ones to grasp this trick easily.





Another tool for learning to multiply 9's is this handy patterns chart. This is something you will want to do with your son or have him make up his own in color. Doing it in color helps the patterns become easier to see and your son will benefit from writing out the patterns himself.
9 |
x |
1 |
= |
0 | 9 |
9 |
x |
2 |
= |
1 | 8 |
9 |
x |
3 |
= |
2 | 7 |
9 |
x |
4 |
= |
3 | 6 |
9 |
x |
5 |
= |
4 | 5 |
9 |
x |
6 |
= |
5 | 4 |
9 |
x |
7 |
= |
6 | 3 |
9 |
x |
8 |
= |
7 | 2 |
9 |
x |
9 |
= |
8 | 1 |
9 |
x |
10 |
= |
9 | 0 |
Tens |
Ones |
||||
9 |
x |
1 |
= |
Tens |
Ones |
||||
9 |
x |
1 |
= |
0 |
Tens |
+ |
Ones |
= |
9 |
0 |
+ |
? |
= |
9 |
0 |
+ |
9 |
= |
9 |
Tens |
Ones |
||||
9 |
x |
1 |
= |
0 |
9 |
Tens |
Ones |
||||
9 |
x |
1 |
= |
0 |
9 |
9 |
x |
2 |
= |
| 9 x 2 = __ | ||
| 2 - 1 = 1 | ||
| 9 x 2 = 1__ | ||
| 1 + ? = 9 | ||
| 1 + 8 = 9 | ||
| 9 x 2 = 18 |
Tens |
Ones |
||||
9 |
x |
1 |
= |
0 |
9 |
9 |
x |
2 |
= |
1 |
8 |
9 |
x |
3 |
= |
This trick only works for 9 x 1 to 9 x 10.
Print a completed Patterns Chart with the answers PDF to post in your child's room or print one without the answers PDF so your child can fill it in.
November 6, 2009
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