9 times 15 is 135 — with the shortcut, the division facts and a drill to make it stick
9 × 15 = 135. That is the short answer, and it is the same answer whichever way round you write the two numbers. Below is where 135 comes from, the shortcut that gets you there without counting, the division facts that travel with it, and the fastest way to move it from "I can work it out" to "I just know it".
9 × 15 = 135. Said out loud in the way most classrooms say it: Nine fifteens are one hundred and thirty-five.
15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 = 135 — that is nine fifteens added together.
Written the other way round the answer does not change. 15 × 9 = 135 as well, because multiplication is commutative — the order of the two factors never affects the product. That halves how many facts you actually have to learn: get 9 × 15 and you have 15 × 9 for free.
Fifteen is ten plus half of ten. Ten nines are 90, half of that is 45, and 90 + 45 = 135.
Both factors are odd, so the answer has to be odd as well. 135 is odd, which rules out a whole class of slips.
Every multiplication fact comes with a division fact on its back. These four all say the same thing about 9, 15 and 135: 9 × 15 = 135; 15 × 9 = 135; 135 ÷ 9 = 15; 135 ÷ 15 = 9.
Learning them as one family rather than four separate things is the single biggest shortcut in times-table practice. If you can answer "135 divided by 9" as fast as you can answer "9 times 15", the fact is genuinely learned rather than just recognised.
In the 9 times table, 135 is the fifteenth step: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135.
In the 15 times table it is the ninth step instead: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180.
Seeing the same number arrive from two directions is what makes it stick. 135 is a landmark in both rows, so whichever table you are drilling you meet it again.
9 × 14 = 126, 9 × 16 = 144, 8 × 15 = 120, 10 × 15 = 150. Those are the answers people most often give by accident when they are a beat too quick.
The gap between neighbours is worth knowing on its own: each extra nine adds 9 to the running total, and each extra fifteen adds 15. So if 9 × 15 = 135 is solid, you can reach 9 × 16 by adding 9 rather than starting again.
Recognising a fact and recalling it under time pressure are different skills. A fact you can work out in four seconds still costs you four seconds every time it appears inside a longer calculation.
Short daily bursts beat long sessions: a 60-second drill every day will fix a table faster than one twenty-minute sitting a week. Mix the fact you are learning in among ones you already know so recall is being tested, not the order of a list.
9 times 15 is 135. In words, nine fifteens are one hundred and thirty-five.
15 times 9 is also 135. Swapping the two factors never changes the answer, so 15 × 9 and 9 × 15 both come to 135.
135 ÷ 9 = 15, because 9 × 15 = 135. The matching fact is 135 ÷ 15 = 9.
Fifteen is ten plus half of ten. Ten nines are 90, half of that is 45, and 90 + 45 = 135.
Yes. 135 is the fifteenth number in the 9 times table, and the ninth number in the 15 times table.
Every multiplication fact from 2 × 2 to 20 × 20 has its own page here, and the full grid is on the multiplication chart.