17 x 100 = 1700
17 times 100 is 1700. Multiplying by 100 shifts both digits two columns to the left, so 17 becomes 17 hundreds. Below is the working, a check, and the sums either side of it.
17 × 100 = 1,700
Adding 17 to itself 100 times gives the same answer.
How to work out 17 x 100
Multiplying by 100 moves every digit two places to the left. The 1 lands in the thousands column, the 7 in the hundreds, and two zeros fill the tens and units. There is nothing to carry, which is why this one is faster done by sight than by columns.
Written out the long way: 17 x 100 = 17 x 10 x 10 = 170 x 10 = 1700.
Where 1700 turns up
On a 24-hour clock 1700 is five o’clock in the afternoon, spoken as “seventeen hundred”. That is the most common reason to see these four digits together with no calculation behind them. In seconds, 1700 is 28 minutes and 20 seconds.
The factors of 1700
1700 breaks down as 2 x 2 x 5 x 5 x 17. Because 17 is prime it comes through the multiplication untouched, so it is the largest prime factor of 1700 and the only one above 5. That makes 1700 divisible by 4, by 25, by 100 and by 17, but not by 3, by 7 or by 9.
Sums people mix this up with
- 17 x 1000 = 17000, one zero further.
- 17 x 10 = 170.
- 17% of 100 is 17, not 1700. Percent means “per hundred”, so that operation multiplies and then divides by the same 100.
16 x 100 = 1600 and 18 x 100 = 1800 sit either side: each step of 1 in the first number moves the answer by exactly 100. The rest are on the multiplication answers page.