West normal university printing plate fourth grade first volume mathematics unit 2 examination paper
First, fill in the blanks.
1. If two addends are represented by A and B respectively, then additive commutative law can be represented as (); If the three addends are represented by a, b and c respectively, then the additive associative law can be expressed as ().
2. Fill in the appropriate number in □.
179-85- 15= 179-(□+□)
272- 103=272- 100-□
383+99=383+ 100-□
3.( )+ 136=300 158+( )=454
395-( )= 105 ( )-326=70
( )+294=374 ( )-400=500
4. Fill in the blanks according to the given formula.
( 1)800-342=458
342+( )=800
800-( )=458
(2)354+ 147=50 1
50 1-( )=354
50 1-( )= 147
5. The sum of the minuend, the minuend and the difference is 240, and the minuend is ().
6. The difference between two numbers is 15. If the minuend increases by 2 and the meiosis decreases by 2, the difference should be ().
Second, the judgment question. (Right painting, wrong painting)
1. The minuend remains the same, and the difference increases by several. ( )
2.□-43= 138, then□ =138-43. ( )
3.273-208=273-200+8 ( )
Additive commutative law is applied in 4.256+128 =128+256. ( )
5. In simple calculation, we usually use additive associative law and commutative law at the same time. ( )
Third, the calculation problem.
1. Write directly.
43+57= 200-29=
450-400= 69+ 13 1=
100+2= 97+3=
204-200= 360+240=
2. Calculate the following questions and check with additive commutative law.
548+294= 326+477=
589+235=
3. Use a simple method to calculate.
274+598 456- 197
279+204 400-346-54
563+89+ 1 1 1 873-48- 152
4. The following is the registration form of infant milk powder, adolescent milk powder, middle-aged and elderly calcium-supplemented milk powder and sugar-free milk powder sold by a supermarket in Binhai 10- 12.
Unit: box
65438+1October165438+1October 65438+February
Baby milk powder 246 287 3 13
Adolescent milk powder 349 286 3 14
Calcium-supplementing milk powder for middle-aged and elderly people 154 105 295
Sugar-free milk powder 149 134 166
A supermarket in Binhai sold * * * () boxes of infant milk powder, * * () boxes of adolescent milk powder, * * * () boxes of calcium-supplemented milk powder for middle-aged and elderly people and * * () boxes of sugar-free milk powder from June to February. Baby milk powder sells () boxes less than adolescent milk powder.
Fifth, solve the problem.
1. I clearly read a 447-page story book. In the first week, he read 135, and in the second week, he read 265 pages. How many pages are left to read?
Children in bright primary school donated 256 yuan to Hope Primary School, 372 yuan to Grade Five and 328 yuan to Grade Six. How much did these three grades donate?
3. The engineering team built a canal with a total length of 484 meters, the first day 148 meters, the second day 152 meters, and the rest on the third day. How many meters were built on the third day?
4. How many chickens, ducks and geese does Grandma keep?
5. The school held a sports meeting, and the number of participants in each grade was as follows:
Unit: person
grade
No.109104 96 98117156.
(1) How many people are there in Grade One, Grade Two and Grade Three?
(2) There are more participants in grade six than in grade three?
(3) Ask a math question and answer it yourself.
6. When Xiao Ming did a subtraction problem, he took subtraction 98 as 89, and the result was 158. What should be the correct result?
West Normal University printing plate fourth grade mathematics unit 2 reference answer
I. 1. a+b=b+a a+b+c=a+(b+c)
2.85 15 3 1
3. 164 296 290 396 80 900
4.( 1)458 342 (2) 147 354
5. 120
6. 19
Second, 1. 2.？ 3.？ 4.？ 5.？
Three. 1. 100 17 1.50 200 102 100 4 600
2.842 803 824 checking calculation
3.872 259 483 0 763 673
Four. 846 949 554 449 103
Verb (abbreviation of verb) 1.447- 135-265=47 (page)
2.256+372+328=956 (Yuan)
3.484-148-152 =184 (m)
4.57+ 154+43=254 (only)
5. (1)109+104+96 = 309 (person)
(2) 156-96=60 (person)
(3) There are not only questions to ask, such as: How many people are there in Grade Four, Grade Five and Grade Six? 98+117+156 = 371(person)
6. 158+89=247 247-98= 149
Look at the "West Normal University Edition, Grade Four, Volume I, Mathematics Unit 2 Examination Paper and Answers" and read:
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