Q: Can two prime numbers be multiplied together to get a 400 digit number?

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Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.

32 x 32 = 1024

625×2=1250

A two digit number whose two digits added together equal 42 and multiplied together equal 82

I think you r cheating Mr.Cheater

A decimal number is multiplied by a non-decimal number the same way any two numbers are multiplied together. The place value of the numbers being multiplied must be kept in mind though. So if 2x3=6, just as 2x30=60, 2x0.3 would be 0.6. For numbers with more than one digit, you would treat the multiplication the same way as for non decimal numbers.

The answer is vague but correct . Take any two prime numbers whose combined digit length is 501 and their product will generate a 500 or a 501 digit number.

456 and 24

Any prime numbers of about 66 or 67 digits will do.

As the numbers 1 to 99 are multiplied together, one factor of the product will be 10 which means the last digit must be 0 (a zero). Without working out the product, it can be seen that every multiple of 5 in the original numbers can be paired up with an even number (that is not a multiple of five) and multiplied together (which produces a multiple of 10) which are all factors of the product together; thus the product will ends with that number of zeros: there are 19 multiples of 5 in the numbers 1-99, so the last 19 digits of the product are all 0 (zero).

2 digit number

The answer will depend on what the highest and lowest numbers are!The answer will depend on what the highest and lowest numbers are!The answer will depend on what the highest and lowest numbers are!The answer will depend on what the highest and lowest numbers are!