Test, Order of operations(GREY):

a) $\displaystyle 150-45-15=$ b) $\displaystyle 52-(36-27)=$ c) $\displaystyle 81\cdot9= $ d) $\displaystyle 11\cdot37=$ e) $\displaystyle 10000\cdot 561=$ f) $\displaystyle 13\cdot(21-8)=$ g) $\displaystyle 208:8=$ h) $\displaystyle 357:21=$ i) $\displaystyle 6+7\cdot2=$ j) $\displaystyle 5\cdot 7-15:3=$ k) $\displaystyle 22:(7+4)+3=$ l) $\displaystyle 31-6\cdot (12-4\cdot 2)=$ m) $\displaystyle 3 \cdot [23-3 \cdot (15-4 \cdot 2)]=$