Calculation formula:
1, number of copies × number of copies = total number of copies/number of copies = total number of copies/number of copies = number of copies.
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, and-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
Graphic calculation formula
1 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: surface area of side length = side length × side length× ×6 S Table =a×a×6 volume = side length× side length× side length v = a× a× a.
3 rectangle c perimeter s area a side length perimeter = (length+width) ×2 C=2(a+b) area = length × width S=ab
4 cuboid v: volume s: area a: length b: width h: high 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 = base x height ÷2 s=ah÷2 triangle height = area x 2 ÷ base triangle base = area x 2 ÷ height.
6 parallelogram s area a bottom h height area = bottom x height s=ah
7 trapezoid s area a upper bottom b lower bottom h height area = (upper bottom+lower bottom) × height ÷2 s=(a+b)× h÷2.
8 circle s area c perimeter ∏ d= diameter r= radius perimeter = diameter x ∏ = 2 x ∏× radius c = ∏ d = 2 x r area = radius x radius x ∏.
9 cylinder v: volume h: height s; Bottom area r: bottom radius c: bottom perimeter lateral area = bottom perimeter× high surface area = lateral area+bottom area× 2 volume = bottom area× high volume = lateral area ÷2 radius.
10 cone v: volume h: height s; Bottom area r: bottom radius volume = bottom area × height ÷3
The formula of sum difference problem (sum+difference) ÷ 2 = large number (sum difference) ÷ 2 = decimal.
The difference between the formula of sum multiple problem and the formula of difference multiple problem ÷ (multiple-1) = decimal decimal x multiple = large number (or sum-decimal = large number) ÷ (multiple-1) = decimal x multiple = large number (or decimal+difference = large number)