Line up the decimals: A. 0.105 B. 0.501 C. 0.015 D. 0.15 Put a 0 at the end of the last one, so they'll all have three digits after the decimal: A. 0.105 B. 0.501 C. 0.015 D. 0.150 Now they are all 'thousandths'. A. 105 thousandths B. 501 thousandths C. 15 thousandths D. 150 thousandths I won't tell you the answer, but I'll bet you can pick out which is the least one now! Edwin