1.  How do we multiply a whole number by a power of 10?
 36 × 10
Add on as many 0's as appear in the power.
Examples.  36 × 10  =  360   Add on one 0.   36 × 100  =  3600   Add on two 0's.   36 × 1000  =  36,000   Add on three 0's. 
2.  How do we divide a whole number by a power of 10?
 36,000 ÷ 10
Subtract as many 0's as appear in the power. Examples. 36,000 ÷ 10  = 3,600  Subtract one zero.  36,000 ÷ 100  = 360  Subtract two zeros.  36,000 ÷ 1000  = 36  Subtract three zeros. 
3. How many 10's are in 46,200? (Remember this is not "What number is in the tens place?)
If I only had 10 blocks how many would I need to make this number? Examples. There are  4,620 10's in 46,200?  Take away the digit in the ones place.
 There are  462 100's in 46,200
 Take away the digit in the ones place and the tens place.  There are  46 1000's in 46,200  Take away the digit in the ones place, tens place and hundreds place. 
