A. Write the missing numbers. Then give the properly used in each equation.
1.20 +_=40 +_
2. (7 x 6] x 5 = (6 x _)
3. (6+12) + (5 + 7) = (5+_) + (_____ +12)
4. 7 x (10+5)= (____________x 10) + (7 x_) 5. 24+ (36 + 50) = ( __+__ ) + 50​