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Dividing whole numbers by 10 and 100

Dividing whole numbers by 10 and 100

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Tutor: Labib

Summary

Dividing whole numbers by 10 and 100

​​In a nutshell

Dividing one or two digit numbers by 1010 or 100100 involves moving place values once or twice to the right respectively. This can be done using a place value table or a decimal point. 



Dividing by 10

To divide a number by 1010, move the digits of the number one place value to the right. 


Example 1

Calculate 70÷1070 \div 10.


Rewrite 7070 in a place value table using zeros as placeholders. 


TENS

ONES

..​​

TENTHS

HUNDREDTHS

77​​

00​​

..​​

00​​

00​​


When dividing by 1010, move the digits one place value to the right. 


TENS

ONES

..​​

TENTHS

HUNDREDTHS

​​

77​​

..​​

00​​

00​​


70÷10=7.\underline{70\div 10 = 7.}​​


Note: You do not have to draw a place value table but they are helpful to show the process of dividing by 1010 or 100100​.



Dividing by 100

To divide a number by 100100, move the digits of the number two place values to the right. 


Example 2

Calculate 23÷10023 \div 100.


Rewrite 2323 with a decimal point using zeros as a placeholder. 

23=23.0023 = 23.00


To divide by 100100, move the digits two place values to the right. This is the same as moving the decimal point two spaces to the left.

23.000.2300=0.23\overset{\curvearrowleft \curvearrowleft}{23}.00 \rightarrow 0.2300 = 0.23


23÷100=0.23.\underline{23 \div 100 = 0.23.}


Note: Zeros at the very end of a number, after the decimal point, are placeholders. They can be removed once you are done with the calculation. 


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FAQs - Frequently Asked Questions

What number acts as a placeholder?

How do you divide a number by 10?

How do you divide a number by 100?

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