www.transum.org/Maths/Activity/Algebra/Collecting_Like_Terms.asp?Level=1
Great questions to practice and some with brackets
writing expressions Level H (X1, 2, 8) I (R2) J (V1, 2) H (X8) - basic simplyfying
simplyfying expressions (inc.brackets) I (R14, 16) J (V15, 17) K (B3)
simple substitution I (R3, 4, 6)
number patterns and rules Level H (W1, 2) L (X7) I (Q4, 6)
Mixed Q's Level I (R1 to 5, 7, 10, 13, 14, 16)