10 times 15 is 150 — with the shortcut, the division facts and a drill to make it stick
10 × 15 = 150. That is the short answer, and it is the same answer whichever way round you write the two numbers. Below is where 150 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".
10 × 15 = 150. Said out loud in the way most classrooms say it: Ten fifteens are one hundred and fifty.
15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 = 150 — that is ten fifteens added together.
Written the other way round the answer does not change. 15 × 10 = 150 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 10 × 15 and you have 15 × 10 for free.
Multiplying by 10 shifts every digit one place to the left, which on a whole number looks like writing a zero on the end. 15 becomes 150.
Because one of the factors is even, the answer has to be even. 150 is, so the parity check passes.
Every multiplication fact comes with a division fact on its back. These four all say the same thing about 10, 15 and 150: 10 × 15 = 150; 15 × 10 = 150; 150 ÷ 10 = 15; 150 ÷ 15 = 10.
Learning them as one family rather than four separate things is the single biggest shortcut in times-table practice. If you can answer "150 divided by 10" as fast as you can answer "10 times 15", the fact is genuinely learned rather than just recognised.
In the 10 times table, 150 is the fifteenth step: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150.
In the 15 times table it is the tenth 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. 150 is a landmark in both rows, so whichever table you are drilling you meet it again.
10 × 14 = 140, 10 × 16 = 160, 9 × 15 = 135, 11 × 15 = 165. 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 ten adds 10 to the running total, and each extra fifteen adds 15. So if 10 × 15 = 150 is solid, you can reach 10 × 16 by adding 10 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.
10 times 15 is 150. In words, ten fifteens are one hundred and fifty.
15 times 10 is also 150. Swapping the two factors never changes the answer, so 15 × 10 and 10 × 15 both come to 150.
150 ÷ 10 = 15, because 10 × 15 = 150. The matching fact is 150 ÷ 15 = 10.
Multiplying by 10 shifts every digit one place to the left, which on a whole number looks like writing a zero on the end. 15 becomes 150.
Yes. 150 is the fifteenth number in the 10 times table, and the tenth 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.