23×17
23
17
___________
161
23
___________
391
or, you have
(20+3)(20-3) = 20^2 - 3^2 = 400-9 = 391
To find the product of 23 and 17, you need to multiply these two numbers together. Here's how you can do it:
Step 1: Write down the two numbers, 23 and 17.
Step 2: Start by multiplying the ones digit of the second number, which is 7, by the first number, 23. Multiply 7 by each digit in 23, starting from the right:
- Multiply the ones digit of 23, which is 3, by 7: 3 × 7 = 21.
- Write down the ones digit (1) and carry over the tens digit (2).
Step 3: Now, multiply the tens digit of the second number, which is 1, by the first number, 23. Multiply 1 by each digit in 23, starting from the right:
- Multiply the tens digit of 23, which is 2, by 1: 2 × 1 = 2.
- Write down the tens digit (2).
Step 4: Add the two partial products and write down the result:
- Add the ones digit partial product (21) to the tens digit partial product (2): 21 + 2 = 23.
- Write down the result, 23.
Therefore, 23 multiplied by 17 equals 391.