Additive commutative law: a+b=b+b Addition Law: a+b+c=a+(b+c) 1 number of shares per share = total number of shares/number of shares = 2 1 multiple × multiple = multiple1multiple = multiple. Total price ÷ quantity = unit price 5 Work efficiency × working hours = total workload ÷ Work efficiency = total working hours ÷ Working hours = work efficiency 6 Addendum+Addendum = sum-one Addendum = another Addendum 7 minus-minus = minus+minus = minus 8 factor × factor = number = quotient dividend. Square c perimeter s area a side length perimeter = side length× 4c = 4a area = side length× side length S=a×a 2 cubic v: volume a: side surface area = side length× side length× 6s table = a. A×a×a 3 rectangle c perimeter s area a side length perimeter = (length+width )× 2c = 2 (a+b). Kloc-0/) surface area (length× width+length× height+volume = length× width× height V=abh 5 triangle s area a bottom h height area = bottom× height ÷2 s=ah÷2 triangle height = area× 2 ÷ bottom triangle bottom = area× 2 ÷ height 6 parallel. × height ÷2 s=(a+b)× h÷2 8 circular S area c perimeter ∏ d= diameter r= radius (1) perimeter = diameter× ∏ = 2×××× radius c =∏ d = 2. Bottom area r: bottom radius c: bottom perimeter (1) lateral area = bottom perimeter x height (2) surface area = lateral area+bottom area x 2 (3) volume = bottom area x height (4) volume = lateral area ÷ 2 x radius 10 cone v: volume h: height. Base area r: base radius volume = base area × height ÷3 Total number ÷ Total number = formula (sum+difference) ÷ 2 = large number (sum-difference) ÷ 2 = sum of decimal and multiple problems ÷ (multiple-1) = decimal × multiple.