Write this number in standard form:

200,000+0+1,000+500+80+0

Write this number in standard form: 

700,000+90,000+0+0+8

Write this number in standard form:

10,000+8,000+200+50+2

Write this number in expanded form: 306,052

Estimate by rounding each number to the nearest 10; then add. $368+41+77=?$  

Estimate by rounding each number to the nearest 10; then add.  $1,439+521+15=?$  

 $572,008-375,639=?$  

 $634,891+257,893=?$  

 $15,706-4,928=?$  

 $47\times33=?$  

 $468\times25=?$  

 $161\times68=?$  

 $59\times17=?$  

Write the next three multiples of 3:

3,6,9,_____,_____,_____.