2
Step-by-step explanation:
(4-5) - (13-18+2)
( -1) - ( -3)
-1 + 3
b) 1/3 * 1/5
step-by-step explanation:
each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5