1, single output × quantity = total output
Total output/quantity = single output
Total output/single output = quantity
2. Speed × time = distance
Distance/speed = time
Distance/time = speed
3. Unit price × quantity = total price
Total price/unit price = quantity
Total price ÷ quantity = unit price
4. Work efficiency × working hours = total workload.
Total amount of work ÷ work efficiency = working hours
Total workload ÷ working time = working efficiency
5. Appendix+Appendix = Total
And-where one addend = the other addend
6. Negative-negative = difference
Negative difference = negative
Difference+Minus = Minus
7. Factor × factor = product (factor is not 0)
Product ÷ One factor = another factor.
8. Dividend bonus = quotient
Dividend = divisor
Quotient × Divider = Divider
9. Division with remainder
Divider = quotient ... remainder
Dividend = quotient × divisor+remainder
A complete collection of commonly used formulas in primary school mathematics (geometric calculation formula)
The circumference of a rectangle = (length+width) ×2 letters formula: C=(a+b)×2.
Square perimeter = side length ×4 letters formula: C=a×4.
Area of rectangle = length× width letter formula: S=a×b
Square area = side length × side length letter formula: s = a× a.
Area of triangle = base × height ÷2 letter formula: S=a×h÷2.
Area of parallelogram = base× high letter formula: S=a×h
Trapezoidal area = (upper bottom+lower bottom) × height ÷2 letter formula: s = (a+b) × h ÷ 2.
Diameter of circle = radius ×2 letters formula: d=r×2.
Radius of a circle = diameter ÷2 letter formula: r= d÷2
Circumference = pi× diameter = pi× radius× 2 letters formula: c = π d = 2π r.
Area of circle = pi × radius× radius letter formula: S=πr
Cuboid volume = length× width× height letter formula: V=abh
Volume of cuboid (or cube) = bottom area × height formula: V=S bottom area × h.
Volume of cube = side length × side length× side length letter formula: v = a.
Lateral area of cylinder = perimeter of bottom× high letter formula: s = bottom of c× h = π dh = 2π rh.
Surface area of cylinder = perimeter of bottom × height+area of circles on both sides. The letter formula is: s = ch+2s = ch+2π r.
Cylinder volume = bottom area × high letter formula: V=Sh
The volume of cone = bottom area × height ÷3 letter formula: V=Sh÷3.