2/5 x 700 = 1400/5 = 2800/10 = 280
3500
700 ten thousandths in scientific notation is: 7e-2 or 7 x 10^-2
700 - 10% = 700 x (1 - (10/100)) = 700 x 0.9 = 630
10 times as much as 700 is 7,000. So 700 is 1/10 of 7,000. 10 times as much as 700 is 1/10 as much as 70,000.
$700 is €662.44 (1/10/17)
700
70 is because 700 divided by 10 is 70.
7 x 10^2
700
10 x 700 = 7000
10% of 700 is 490