Here are two examples
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If you multiply 2*9, you get 18. Multiply that by 10 to get a three digit number, and you get 180.
It can have up to 5 digits.
To multiply a 2-digit number by another 2-digit number, you can use the standard multiplication method. Multiply the ones digit of the second number by both digits of the first number and write the results in the appropriate place value positions. Then, multiply the tens digit of the second number by both digits of the first number and place them in the corresponding positions, considering any carry-overs. Finally, add the two partial products to get the final result.
You multiply the one digit number on the bottom to every number on the top starting at the right and so on with every other number on the bottom.
4 options for the first digit, 3 options for the second digit, 2 options for the third digit. Multiply the number of options together, and you find how many 3-digit numbers you can get.