2. 1 multiple× multiple = multiple1multiple = multiple/multiple = 1 multiple
3. Speed × time = distance/speed = time/distance/time = speed.
4. Unit price × quantity = total price ÷ unit price = total quantity ÷ quantity = unit price
5. Work efficiency × working hours = total workload ÷ work efficiency = working hours ÷ total workload ÷ working hours = work efficiency.
6. Appendix+Appendix = sum-one addend = another addend
7. Minus-Minus = Minus-Minus = Minus+Minus = Minus
8. Factor × factor = product ÷ one factor = another factor.
9. Dividend = quotient dividend = divisor quotient × divisor = dividend
Calculation formula of mathematical graphics in primary schools
1, square c perimeter s area a side length
Perimeter = side length ×4 C=4a
Area = side length × side length S=a×a
2. cube v: volume a: side length
Surface area = side length × side length× ×6 S Table =a×a×6
Volume = side length × side length × side length v = a× a× a.
3. Rectangular C perimeter S area A side length
Circumference = (length+width) ×2 C=2(a+b)
Area = length × width S=ab
4. cuboid v: volume s: area a: length b: width h: height
Surface area (length× width+length× height+width× height )× 2s = 2 (AB+AH+BH)
Volume = length× width× height V=abh
5, triangle S area A base H height
Area = bottom × height ÷2 s=ah÷2
Height of triangle = area ×2÷ base of triangle = area ×2÷ height
6, parallelogram S area A base H height
Area = bottom × height s=ah