(1) There are 25 girls and 20 boys. The number of boys accounts for ()% of girls.
(2) The actual afforestation area increased by 20% compared with the original plan, and the actual afforestation area was equivalent to ()% of the original plan.
(3) The reciprocal of the largest two digits is (), and () is the reciprocal.
(4) The sum ratio is (), and the simplification ratio is ().
(5)( )÷8= =0.5=( )%=( ):( )。
(6) 25% () is 25, and 25% of 25 is ().
(7) Among 0.333, 33% and 0.3, the largest number is () and the smallest number is ().
(8) Fill in ""or "=" below.
×24○ 5÷8○62.5%
36÷ ○36 × ○
A wire is 20 meters long. I used it for the first time and used it for the second time, and there are () meters left.
(10) Cut the largest circle from a square paper with a side length of 10 decimeter. The circumference of this circle is () decimeter and the area is () square decimeter.
Second, choose the serial number of the correct answer and fill it in brackets. (65438+ 0 point for each small question, ***5 points)
(1) divided by a number that is not 0, this number is ().
A, expand 7 times b, shrink 7 times c, shrink 7 times.
(2)a is a natural number that is not 0. In the following formula, the number of () is the smallest.
a、a× B、a \u C、a \u
(3) For a project, Team A will do it alone for 5 days and Team B will do it alone for 4 days. The work efficiency ratio between Team A and Team B is ().
a、5 :4 B、4 :5 C、
(4) The quotient of 7 ÷ 9 is approximately equal to ().
a、77% B、77.8% C、77.7%
(5) The number of A is 1.25 times that of B, and the number of B is ()% less than that of A. ..
a、25 B、75 C、20
Third, the judge. ("∨" in brackets means correct, and "×" means wrong. For each small problem, * * *)
The ratio of the circumference to the diameter of a circle is π. ( )
(2) A batch of trial-produced products, 120 pieces are qualified, 30 pieces are unqualified, and the qualified rate is 80%. ( )
(3) The first rope is meters long, the second rope is longer than the first one, and the length of the second rope is 1 meter. ( )
(4) The height ratio of Xiaoqing and Xiaohua is 5: 6, and Xiaoqing is shorter than Xiaohua. ( )
(5) Enlarge the former item of a ratio by three times and reduce the latter item by three times, and the ratio remains unchanged. ( )
Fourth, calculation.
(1) Numbers are written directly. (0.5 points for each type, ***4 points)
÷ = × = 1.8× = ÷3=
3.2- = + = 10÷ 10%= 6.8×80=
(2) How to calculate simply. (3 points for each type, *** 18 points)
6÷ - ÷6 × ÷( - )
×3.2+5.6×0.5+ 1.2×50% [ -( + )]÷
99× 1 1.58-(7 + 1.58)
(3) Solve the equation. (3 points for each type, *** 12 points)
X+ X= 17- 120%X=5
X- 12%X=2.8 16 × - X=
(4) Formula calculation. (3 points for each small question, ***6 points)
A, the difference is a small part of their total?
The ratio of B, A and B is 3: 4. Subtract A to get B and get B.
Fifth, the application problem. (6 points for each small question, ***30 points)
(1) Dig a 20-kilometer-long canal. Dig the full length on the first day and the full length on the second day (calculated by the following formula).
A, * * * How many kilometers have you dug in two days? B: How many kilometers were dug on the first day compared with the second?
C, how many kilometers are left?
(2) The current price of the computer is 2800 yuan, which is lower than the original price. What percentage is 700 yuan?
(3) It takes 8 hours for Party A to type a manuscript by computer, and Party B will type it alone 10 hour. Now Party A and Party B are typing together. How many hours will it take to finish this manuscript?
(4) The weight of a pile of fertilizer is equal to this pile of fertilizer plus tons. How many tons is this pile of fertilizer?
(5) The perimeter of a pillar in front of the cinema is 3 14cm. What is the cross-sectional area of this column?