(full name)
I am best at filling in the blanks. (20 points)
1. Fill in the form
Additive commutative law's laws of addition and association, multiplication and exchange, multiplication and association, multiplication and distribution.
Expressed in letters
2. Fill in the operation symbol in □ and fill in the appropriate number on the horizontal line.
( 1)436-279-2 1=436-(279□_____)
(2)34× 125×8=34×(___□____)
(3) 120÷5÷4= 120÷(___□____)
(4)49×38+ 15×38+38=(49+___+___)×___
3. put ">" in □ "<; Or "=".
65 1-45-355□65 1-(45+355)
12× 15×25□ 12×( 15+25)
80× 125□ 10×8× 125
15×( 14+6)□ 15× 14×6
Second, the judge judges right and wrong. (Draw "√" correctly and "×" incorrectly) (5 points)
1.2 15-37+33=2 15-(67+33) ( )
2.240÷5÷4=240÷(5×4) ( )
3. 102×47= 100×47+2 ( )
4.85× 16=85× 10×6 ( )
5.99× 125+ 125=(99+ 1)× 125 ( )
Third, merit-based admission. (Fill in the serial number of the correct answer in brackets) (4 points)
1.53×24+53×36=53×(24+36) Use ().
A. Multiplicative commutative law B. Multiplicative associative law
C. law of multiplicative distribution
2. The simple algorithm of125× 4× 25× 8 is ().
A.( 125×8)×(4×25)
B. 125×8+(4×25)
C.( 125×25) ×(4×8)
3.792× 99 = 792×100 □ 792×1,□ should be filled in ().
A.+b .-c×
4. Multiply three numbers, the first two numbers are multiplied or the last two numbers are multiplied first, and the product is unchanged. This is the so-called law of multiplication ().
A. Exchange B. Combination C. Distribution
Fourth, the math clinic. (Draw "√" correctly, draw "√" incorrectly, and correct it) (3 points)
1.675-(275+43) 2.76×99+76 3、47×99
=675-275+43 =76×(99+ 1) =47×(99+ 1)
=400+43 =76× 100 =47× 100
=443 =7600 =4700
( ) ( ) ( )
5. I am a psychic. (14)
1. Write the number directly.
15× 1 1= 2400÷25= 180-79-2 1= 25× 13×4=
200÷5÷4= 480÷3÷8= 125×3×8= 16×99=
2. Calculate the following questions as simply as possible.
2 14×27- 14×27 478- 163- 137 5000÷ 125÷8
28 1+93+ 1 19+207 99×34
6. Which algorithms are used in the following formula? (5 points)
1.49+ 137= 137+49 ( )
2. 19×4=4× 19 ( )
3. 172+39+28+26 1=( 172+28)+(39+26 1) ( )
4.(8×79) × 125=(8× 125) ×79 ( )
5.32×43+32×57=32×(43+57) ( )
Seven, I will do the questions as required. (Calculate first, then put it. "
1.490÷7+560÷7= (490+560) ÷7=
490÷7+560÷7□(490+560) ÷7
2.340÷2+480÷2= (340+480) ÷2=
340÷2+480÷2□(340+480) ÷2
Judging from the above two sets of formulas, what are your rules? (represented by letters a, b and c)
Eight, column calculation. (9 points)
What is the sum of the product of 1. 125 and 79 plus the product of 125 and 2 1?
2. The divisor is 32, the quotient is 15, the remainder is 9, and what is the dividend?
What's the difference between 3.777 and 560 divided by 7?
Nine, solve the problems in life. (33 points)
1. A comic book has 188 pages. Linlin read 57 pages on the first day and 43 pages on the second day. How many pages are left?
There are 4 bookcases in Miss Li's house, with 9 floors and 25 books on each floor. How many books are there in Miss Li's house?
3. There are fruit trees 1268 in the orchard, including 475 pear trees, 325 jujube trees and the rest apple trees. How many apple trees are there?
A rose exhibition was held in the park. Red roses and yellow roses 15 rows, 24 pots of red roses and 26 pots of yellow roses. How many pots of red roses and yellow roses were put in?
.5. The statistics of the first issue of Challenge Moderators are as follows. (unit: minutes)
Total number of on-site hosts of individual speeches and talent shows of players
1 number 92 88 90
No.2 90 92 89
No.3
(1) Fill in the form completely.
(2) How many points is the highest score in each round more than the lowest score?
(3) Please ask a math problem.
Ability improvement (10)
Carelessness due to carelessness, 70×(★+5) was wrongly calculated as 70×★+5. Please help me calculate. What is the difference between the result he got and the correct result?