The best thing about problem solving is sharing time, because I learn new strategy's .
I have learnt making tens and one subtracting in parts and adding.
An example of a problem and my working is 16 + 15=31
I did 10+10=20 6+ 5=11 11+20=31 so it is 31
I have learnt making tens and one subtracting in parts and adding.
An example of a problem and my working is 16 + 15=31
I did 10+10=20 6+ 5=11 11+20=31 so it is 31