1, number of copies × number of copies = total number of copies, total number of copies/number of copies = number of copies, total number of copies/number of copies = number of copies. ?
2, 1 multiple × multiple = multiple, multiple1multiple = multiple, multiple = 1 multiple. ?
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 hours = total work, total work ÷ work efficiency = working hours, total work ÷ 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 product ÷ one factor = another factor. ?
9. Dividend/Divider = quotient dividend/quotient = divisor quotient × divisor = dividend.
10, square c perimeter s area a side length perimeter = side length× 4c = 4a area = side length× side length s = a× a?
1 1, cube v: volume a: side surface area = side length× side length× 6s table =a×a×6 volume = side length× side length× side length V = a× a× a?
12, rectangle c perimeter s area a side length perimeter = (length+width) ×2 C=2(a+b) area = length× width S=ab. ?
13, 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. ?
14, triangle s area a base h height area = base × height ÷2 s=ah÷2 triangle height = area× 2 ÷ base triangle base = area× 2 ÷ height. ?
15, parallelogram s area a bottom h height area = bottom x height s=ah. ?
16, trapezoidal s area a upper bottom b lower bottom h height area = (upper bottom+lower bottom) × height ÷2 s=(a+b)× h÷2. ?
17, circle s area c perimeter ∏ d= diameter r= radius perimeter = diameter x ∏ = 2 x ∏× radius c = ∏ d = 2 x r area = radius x ∏. ?
18, 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. ?
19, cone v: volume h: height s; Bottom area r: bottom radius volume = bottom area × height ÷3.
Fifth grade mathematics knowledge points:
1. Observation object: First, observation object. When we look at a plane figure from one direction, we can't determine the unique shape of a geometric figure, while the plane figure observed from three aspects determines the unique shape of the geometric figure. We should be able to draw the front, top and side plane figures that we can see and imagine according to the given geometric figures.
2. Factors and multiples: The definition of factors and multiples is an important knowledge of grade five. When the main knowledge point is that large numbers can be divisible by decimals, large numbers are multiples of decimals, and decimals are a factor of large numbers.
3. Cuboid and cube: The definition of cuboid is that a three-dimensional figure surrounded by six rectangles is called cuboid. A cuboid is characterized by six faces, eight vertices and 12 sides. The opposite faces are exactly the same and the opposite sides are equal in length. The definition of cube is that a three-dimensional figure surrounded by six identical cubes is called a cube. A cube is characterized by eight vertices and 12 sides, each of which has the same length.
4. Meaning and nature of the score: The meaning of the score is to divide the unit 1 into several parts on average, and the number represented by one part is called decimal unit. The essence of a fraction is that the numerator and denominator expand or shrink by the same multiple at the same time, and the size of the fraction remains the same!