1, number of copies × number of copies = total
Total copies/number of copies = number of copies
Total copies/number of copies = number of copies
2, 1 multiple× multiple = multiple
Multiply1Multiply = Multiply
Multiply/Multiply = 1 Multiply
3. Speed × time = distance
Distance/speed = time
Distance/time = speed
4. Unit price × quantity = total price
Total price/unit price = quantity
Total price ÷ quantity = unit price
5. Work efficiency × working time = total workload.
Total amount of work ÷ work efficiency = working hours
Total workload ÷ working time = working efficiency
6. Appendix+Appendix = Total
And-one addend = another addend
7. Negative-negative = difference
Negative difference = negative
Difference+Minus = Minus
8. Factor × factor = product
Product ÷ One factor = another factor
9. Dividend bonus = quotient
Dividend = divisor
Quotient × Divider = Divider
10, square
C perimeter, s area, a side length
Perimeter = side length ×4
C=4a
Area = side length × side length
S=a×a
1 1, 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
12, rectangle
C perimeter, s area, a side length
Circumference = (length+width) ×2
C=2(a+b)
Area = length × width
S=ab
13, cuboid
V: volume, s: area, a: length, b: width and h: height.
Surface area (length× width+length× height+width× height) ×2
S=2(ab+ah+bh)
Volume = length× width× height
V=abh
14, triangle
S area, a bottom, h height
Area = bottom × height ÷2
s=ah÷2
Height of triangle = area ×2÷ base.
Triangle base = area ×2÷ height