18 times table

The 18 times table

Fact	Answer	Fact	Answer
18 × 1	18	18 × 7	126
18 × 2	36	18 × 8	144
18 × 3	54	18 × 9	162
18 × 4	72	18 × 10	180
18 × 5	90	18 × 11	198
18 × 6	108	18 × 12	216

Two ways to get there from the grid

Double the nine. 18 is 9 doubled, so 18 × 7 is 9 × 7 doubled: 63 becomes 126. Every answer you need is already sitting in the 9 row above.

Twenty minus two. 18 × 7 is 20 × 7 less 2 × 7, or 140 − 14 = 126. This one is quicker in your head for the bigger multipliers: 18 × 12 = 240 − 24 = 216.

Checking an answer

Every multiple of 18 passes two tests at once. It is even, and its digits add up to a multiple of 9. Take 126: it ends in 6, and 1 + 2 + 6 = 9. Take 198: even, and 1 + 9 + 8 = 18. Fail either test and the answer is wrong.

The usual slip is dropping a carry while doubling. 9 × 8 = 72, doubled, is 144 and not 134 — and the digit test catches it straight away, because 1 + 3 + 4 = 8 is not a multiple of 9.

Past twelve

The row keeps going the same way. Ten lots of 18 make 180, so anything beyond twelve is 180 plus the smaller fact: 18 × 15 = 180 + 90 = 270. The same trick gives 18 × 18 = 180 + 144 = 324 and 18 × 20 = 360.

The neighbouring rows have pages of their own: the 13 times table starts the teens, and the times table 1-12 covers the core grid. Everything else is listed under multiplication charts.