The 15 times table
Also written as the multiplication table of 15. Here it is in full to 15 x 20, with the patterns worth pointing out, the fact children trip on, and free practice that does not need a sign-up.
15 x 1 to 15 x 12
| 15 × 1 | 15 |
|---|---|
| 15 × 2 | 30 |
| 15 × 3 | 45 |
| 15 × 4 | 60 |
| 15 × 5 | 75 |
| 15 × 6 | 90 |
| 15 × 7 | 105 |
| 15 × 8 | 120 |
| 15 × 9 | 135 |
| 15 × 10 | 150 |
| 15 × 11 | 165 |
| 15 × 12 | 180 |
15 x 13 to 15 x 20
| 15 × 13 | 195 |
|---|---|
| 15 × 14 | 210 |
| 15 × 15 | 225 |
| 15 × 16 | 240 |
| 15 × 17 | 255 |
| 15 × 18 | 270 |
| 15 × 19 | 285 |
| 15 × 20 | 300 |
Schools usually require up to twelve. The rest is here for children who want it, and it is where mental arithmetic starts to pay off.
Worth pointing out
Patterns in the 15 times table
- The answers alternate between ending in 5 and ending in 0.
- Every answer is the ten times answer plus half of it.
The easiest way to learn it
Multiply by ten, then add half of that. For 15 x 6, ten sixes are 60, half of 60 is 30, and 60 plus 30 is 90.
The fact children get wrong
15 x 7 is 105, the first answer in this table to pass one hundred, which throws children who are expecting a two-digit answer.
On the abacus
Fifteen is ten plus five, and five is a single heaven bead, so this table is unusually quick to build on a soroban.
Charts build familiarity. Recall comes from retrieval, a few minutes a day. Print the times tables sprint, or try the free virtual abacus where multiplication becomes bead positions rather than something to memorise.
Common questions
What is the 15 times table?
The 15 times table is 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, continuing to 15 x 20 which is 300. It is the same thing as the multiplication table of 15: each answer is 15 added to the one before it.
What is the easiest way to learn the 15 times table?
Multiply by ten, then add half of that. For 15 x 6, ten sixes are 60, half of 60 is 30, and 60 plus 30 is 90.
Which fact in the 15 times table do children get wrong most often?
15 x 7 is 105, the first answer in this table to pass one hundred, which throws children who are expecting a two-digit answer.
What is 15 x 12?
15 x 12 is 180. Twelve is the highest multiplier most primary schools require, though children who go further will need up to 15 x 20, which is 300.
Every times table
If the tables are a struggle
The problem is usually not the table
A child who is still counting to work out 15 x 3 has no attention left for 15 x 8. Fluency underneath is what makes the tables stick, and it is what abacus training builds.
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