# What is 100 1000 100

## Multiply and divide by multiples of 10, 100, 1000, ...

bettermarks »Math book» Numbers »Natural numbers» Multiply and divide with large numbers - Mental arithmetic »Multiply and divide with multiples of 10, 100, 1000, ...

### Multiply by multiples of 10, 100, 1000, ...

If you multiply a number by multiples of,,, ..., delete all zeros on the right of both up to the first digit with a non-zero digit, multiply the numbers obtained in this way and then append all deleted zeros to the result.

First you do the math. Then you add the three zeros of the second factor to the:.

First you do the math. Then you add the two zeros of the second factor to the:.

First you do the math. Then you add the three zeros of the two factors to the:.

### Divide by multiples of 10, 100, 1000, ...

If you divide a large number by multiples of,,, ..., delete the same number of zeros at and on the right and divide the numbers obtained in this way. That is the result you are looking for.

First you do the math. Of the deleted zeros, the dividend has one more zero than the divisor:.

First you do the math. Of the deleted zeros, the dividend has one more zero than the divisor:.

First you do the math. Of the deleted zeros, the dividend has two more zeros than the divisor:.

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