Lesson
If you know your 10 times tables and you know your $1$1 times tables, then it won't be too hard to learn your $11$11 times tables! We know that $10+1=11$10+1=11 and that multiplication is looking at equal sized groups.
So $10$10 groups plus $1$1 group equals $11$11 groups!
Remember!
Any number multiplied by $1$1 is itself.
e.g. $1\times5=5$1×5=5, $1\times12=12$1×12=12, $1\times100=100$1×100=100 and so on.
So if we're given a question, such as $11\times6$11×6, we could think:
| $10\times6$10×6 | $=$= | $60$60 |
| $1\times6$1×6 | $=$= | $6$6 |
| So $11\times6$11×6 | $=$= | $60+6$60+6 |
| $=$= | $66$66 |
Pretty Patterns in the 11 Times Tables
Watch this video now to see the cool pattern in the $11$11 times tables that will make them easier to learn?
Discuss
- What pattern did you see in the $11$11 times tables?
- Why did it stop at $11\times9$11×9? (Hint:Think about place value.)
Worked Examples
Question 1
$1\times11$1×11
Question 2
$11\times2$11×2
Question 3
$11\times11$11×11