Summer homework has a new definition, and a few schools have carried out high-quality practical activities to turn summer homework into activities and enrich students' after-school life. The following is the answer to the fourth grade math summer homework, I hope everyone will read it carefully!
1. Select and fill in the number of the correct answer (). 4%
The formula for the result that 1. equals 36×25 is ().
a 、( 4×25) ×(9×25) b 、( 9+4)×25
c 、( 4×25) +(9×25) d 、( 4×25) ×9
2. The operation order of [1188-5× (66+134)] 94 is ().
A, add → subtract → multiply → divide B, add → multiply → subtract → divide
C, multiply → add → subtract → divide d, multiply → divide → add → subtract
Two. calculate
1, the number is written directly.
40×25= 64÷8×5= 28+ 169+72= 32×3÷32×3=
800÷40= 125×8= 60+840÷70= 3×( 36+54 )=
3000÷60-3000÷75= 100-48+ 152=
2. Calculate with recursive equation
5000-666÷37×34 29×45-45× 17
(73+54)×(72÷9) 20×[250+(265-225) ]
928-28×(73-46) 7800÷[300+5×( 66+ 134 )]
fill (up) a vacancy
1, we call the amount of work done per hour (every minute, every day, etc.). ) ().
2. Workload = () × () Work efficiency = () ⊙ ()
The factory assembles 20 machines every day and 680 machines in 34 days.
The figure representing the workload is (), with 20 units representing () and 34 days representing ().
4. In an expression, if there are both parentheses and square brackets, calculate one of () first, and then one of ().
5. Combine "45-15 = 3030 ÷ 3 =106×10 = 60" into a comprehensive formula:
6.65×(207-87÷29) is described in words as follows:
4. List the comprehensive formula and solve it according to the tree diagram. 5%
Can you count "24" with four cards in the following four groups? Please list the comprehensive formulas and calculate them. 10%
4、3、6、8 ? 10、4、2、8
6. Application questions. Thirty percent
1. This toy factory produces a kind of toy. It was originally planned to produce 60 toys every day, which was completed in four days, but the task was actually completed in three days. How many more toys can you actually make every day?
2. A truck goes from A to B at a speed of 50km/h, and reaches the midpoint of the two places after 12 hours. How many meters is there between A and B?
3. The school bought a rope180m long, cut off10m and made five skipping ropes. How many skipping ropes can the remaining rope make?
Xiaopang and Xiaoya go swimming in the swimming pool. Xiao Pang swam 400 meters, more than Xiao Xiao 100 meters, and Xiao Ya swam twice as far as Mix. How many meters did Xiaoya swim?
The store brought 600 kilograms of oranges, three boxes more than bananas. It is known that each box of oranges is 20 kilograms and each box of bananas is 26 kilograms. How many kilograms of bananas were shipped?
6. The school bought XX kilograms of coal and used it for four days, leaving 1400 kilograms. How many kilograms of coal is used on average every day?
7. There is a rectangular playground, 60 meters long and 20 meters wide. Find out the area of the playground. How many meters is a lap?
8. The floor of the swimming pool is 4m long and 2m wide. If the floor is paved with square floor tiles with a side length of 2 meters, how many pieces do you need?
& gt& gt& gt reference answer
First, select and fill in the number of the correct answer (). 4%
The formula for the result that 1. equals 36×25 is (d).
a 、( 4×25) ×(9×25) b 、( 9+4)×25
c 、( 4×25) +(9×25) d 、( 4×25) ×9
2. The operation order of [1188-5× (66+134)] ÷ 94 is (b).
A, add → subtract → multiply → divide B, add → multiply → subtract → divide
C, multiply → add → subtract → divide d, multiply → divide → add → subtract
Second, the calculation
1, the number is written directly.
40×25= 100 64÷8×5=40 28+ 169+72=269 32×3÷32×3=9
800÷40=20 125×8= 100 60+840÷70=72 3×( 36+54 )=270
3000÷60-3000÷75= 10 100-48+ 152=204
2. Calculate with recursive equation
5000-666÷37×34
=5000- 18×34
=5000-6 12
=4388
29×45-45× 17
=45×(29- 17)
=45× 12
=540
(73+54)×(72÷9)
= 127×8
= 10 16
20×[250+(265-225) ]
=20×[250+40]
=20×290
=5800
928-28×(73-46)
=928-28×27
=928-756
= 172
7800÷[300+5×( 66+ 134 )]
=7800÷[300+5×200]
=7800÷[300+ 1000]
=7800÷ 1300
=6
fill (up) a vacancy
1. We call the amount of work done per hour (every minute, every day, etc.). ) (work efficiency).
2. Workload = (working efficiency) × (working time)
Work efficiency = (workload) ÷ (working hours)
The factory assembles 20 machines every day and 680 machines in 34 days.
The number representing the workload is (680), 20 units represent (work efficiency) and 34 days represent (working hours).
4. In an expression, if there are both brackets and brackets, count the ones in (brackets) first, and then the ones in (brackets).
5. Combine "45-15 = 3030 ÷ 3 =106×10 = 60" into a comprehensive formula:
6×[(45- 15)÷3]
6.(207-87÷29) ×65 is described in words as follows:
What is the product of 207 minus 87 divided by 29 and multiplied by 65?
4. List the comprehensive formula and solve it according to the tree diagram. 5%
(22-49÷7)× 15
=(22-7)× 15
= 15× 15
=225
Can you count "24" with four cards in the following four groups? Please list the comprehensive formulas and calculate them. 10%
4、3、6、8
(8+4)×(6÷3) or (8÷4+6)×3 or 4×3×(8-6), etc.
10、4、2、8
10×2+(8-4) or (10-4)×(8÷2) or 10+4+2+8, etc.
6. Application questions. Thirty percent
1. This toy factory produces a kind of toy. It was originally planned to produce 60 toys every day, which was completed in four days, but the task was actually completed in three days. How many more toys can you actually make every day?
60×4÷3-60=20 (piece)
2. A truck goes from A to B at a speed of 50km/h, and reaches the midpoint of the two places after 12 hours. How many meters is there between A and B?
50× 12×2= 1200 (m)
3. The school bought a rope180m long, cut off10m and made five skipping ropes. How many skipping ropes can the remaining rope make?
(180-10) ÷ (10 ÷ 5) = 85 (root)
Xiaopang and Xiaoya go swimming in the swimming pool. Xiao Pang swam 400 meters, more than Xiao Xiao 100 meters, and Xiao Ya swam twice as far as Mix. How many meters did Xiaoya swim?
(400- 100)×2=600 (m)
The store brought 600 kilograms of oranges, three boxes more than bananas. It is known that each box of oranges is 20 kilograms and each box of bananas is 26 kilograms. How many kilograms of bananas were shipped?
(600÷20-3)×26=702 (kg)
6. The school bought XX kilograms of coal and used it for four days, leaving 1400 kilograms. How many kilograms of coal is used on average every day?
(XX- 1400)÷4= 150 (kg)
7. There is a rectangular playground, 60 meters long and 20 meters wide. Find out the area of the playground. How many meters is a lap?
(60-20)×60=2400 (square meter)
(60-20+60)×2=200 (m)
8. The floor of the swimming pool is 4m long and 2m wide. If the floor is paved with square floor tiles with a side length of 2 meters, how many pieces do you need?
4×2=8 (square meters) 8 square meters =800 square decimeters 800(2×2)= 200 (blocks)
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