This is a relatively easy times table to master. Any single digit number from 1-9, when multiplied by 11, gives that same digit number in the ones and tens place.
For example, take 3 for instance. 3 x 11 gives us 33. The same digit 3 is now both in the ones and tens place, giving us 33.
What about 2 digit numbers like 10, 11, 12? Well, we need to employ a different strategy for this. For any 2 digit number, when we multiply them to 11, the first thing we need to do is to move the first digit from the tens place to the hundreds place. For example 10 x 11, we move the first digit, 1, to the hundreds place, and we will get 1_0. The tens place is now empty. Next we will add both the digits from the original 2 digit number together, and the result will go into the empty tens place. In our example, 10, we will add 1 and 0, which gives us 1. So 1 goes into the tens place to give us the final answer of 110.
Give it a go and try this out for the other 2 digit numbers.
Now, you must be wondering, what about 19 x 11? 1 + 9 would give us 10, so what do we do? Good thinking! All we need to do is to place the digit in the ones place, in this example, 0 in the tens place of our answer. The digit in the tens place, in this example, 1 is added on to the digit in the hundreds place of our answer. This should give us the digit 2 in the hundreds place, for a final answer of 209.