In my maths work shop we learnt how to solve problems by breaking the bigger number up.For example:

27 X 9= 243      20 x 9 = 180      7 x 9 =63     180 + 63 = 243

we are learning to add Decimals and use them to help us with money.the hard pert was finding out what 100.50 + 100.50 =.