Maths Working Out

Today I decided to do some maths because I don't do a lot of maths on my blog. I'm just going to do some working out and show you guys how I normally work out my maths.

12+67=?

So you take the 10 and the 60 then take the 2 and 7 which adds so...

60+10=70 & 2+7=9 so 70+9=79 (Comment if you these are right!)

86+39=?

80+30=110   6+9=15  110+15=125

64+47=
60+40=100 4+7=11 100+11=111

132+85=
30+80=110 2+5=7 110+7(+100)= 217

217+93=
10+90=100 3+7=10 100+10(+200)=310

Subtraction

47-29=
47-20=27-7=20 but we still need to take off nine so-2=18

37-28=
37-20=17-7=10-1=9

47-14=
47-10=37-4=33

49-28=
49-20=29 29-8=21

49-16=
49-10=39-6=33

56-27=
56-20=36-6=30-1=29

49-31=
49-30=19-1=18

52-23=
52-20=32-3=29

47-29=
47-20=27-7=20-2=18