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

Area & Perimeter

Today we did area and perimeter. We had to explain it in google drawing so here is mine. First you measure length and width then times them which would make area. L x W = A