We will also look at fact families:
From 2 x 8 = 16, we also know that 8 x 2 = 16, 16 divided by 2 = 8 and 16 divided by 8 = 2.
This is useful because we can use these inverses to check our calculations.
If I did 235 + 346 = 581, I could check by doing 581 - 346 and if the answer is 235, I know I'm right!
Here are the week's weblinks for games - Keep practising!
Monday - Negative Numbers
http://www.topmarks.co.uk/Flash.aspx?f=HigherAndLower
plus the game below
Tuesday - Fact Families and Inverses
http://www.topmarks.co.uk/Flash.aspx?f=triangularcardsv4
http://nrich.maths.org/6290
Wednesday - Balancing calculations
http://www.topmarks.co.uk/Flash.aspx?f=CalcBalancev5