Math HW links-Due on 27th Sept

http://www.aaamath.com/g4_32_x1.htm
http://www.aaamath.com/g4_32_x2.htm
http://www.aaamath.com/g41c_rx1.htm
http://www.aaamath.com/g41d_rx1.htm
http://www.aaamath.com/g41e_rx1.htm
Estimating sums
http://www.aaamath.com/g46a_ex1.htm
Estimating differences
http://www.aaamath.com/g46b_ex1.htm