What to notice
The doubled digit comes from 11 being 10 + 1. 11 × 6 is ten 6s and one more 6, so 60 + 6 = 66. Once your child sees that split, the pattern stops being magic and becomes something they understand.
The pattern changes at 11 × 10 = 110, 11 × 11 = 121 and 11 × 12 = 132. The same split still works: 11 × 12 is 10 × 12 = 120 plus one more 12, and 120 + 12 = 132. These three are worth learning on their own rather than forcing the doubled-digit pattern onto them.
There is a second pattern that some children discover for 11 times a two-digit number: write the two digits apart and put their sum in the middle. For 11 × 12, the 1 and the 2 with 3 between them make 132. It works whenever the two digits add to less than 10, so it needs an extra step for something like 11 × 48.
Elevens also make a good first look at checking by estimating. 11 × 8 must be a little more than 10 × 8 = 80, so an answer like 98 or 18 is clearly off, while 88 sits just where it should. Asking “is it a bit more than the 10s answer?” catches most slips in this table.
How to practise at home
- Write 11 × 1 to 11 × 9 as a list and ask your child what they notice before you say anything.
- Practise “ten of them and one more” aloud on 11 × 10, 11 × 11 and 11 × 12.
- Use a soccer team of 11 players: “three teams on the field, how many players?” is 11 × 3.
- Drill the 11s alongside the 10s, since the two tables are so closely linked: 10 × 7 = 70, then 11 × 7 = 77.
Slips to watch for
- Carrying the doubled-digit pattern too far, answering 1010 for 11 × 10 or 1111 for 11 × 11. The split fixes it: ten 11s is 110.
- Answering 122 for 11 × 12 by mixing the two patterns. Go back to 10 × 12 plus one more 12.
- Doubling instead, and answering 14 for 11 × 7 because it looks like 2 × 7 at a glance. Read the 11 aloud as eleven.