One,
Elementary arithmetic (1)
first kind
(
30
minute
)
Xin Kai qidian
(Example
1
example
2
Practice one first.
1
~
three
Title)
1.
Explore the temple of knowledge.
(
1
)
.
In the mixed operation formula without brackets, if only
If there is addition and subtraction, or only multiplication and division, please press (
from left to right
Sequential calculation
)
(
2
)
.
There are no brackets in the formula of two-step mixed operation, such as
If there are both addition and subtraction and multiplication and division, it is necessary to calculate (
Multiplication and division
)
Post-calculation (
Addition and subtraction
)
(
three
)
.
exist
127
+
560
÷
eight
, should first calculate (
separate
)
Recalculate (
add
)
(
four
)
.
exist
187
÷
1 1
×
nine
, should first calculate (
separate
)
Recalculate (
increase
)
(
five
)
.5 12
and
304
The sum of is
eight
Belong to (
102
) times.
2.
Golden eyes.
(Mark "√" for the right and "×" for the wrong.
)
(
1
)
.
The operation order of elementary arithmetic is multiplication before division and addition first.
After that.
(
╳
)
(
2
)
.
will
100
-
72=28
and
28
÷
4=7
Column into a comprehensive formula is
100
-
Seventy two
÷
4=7.
(
╳
)
(
three
)
.
calculate
15
×
six
÷
2
When, multiply first, then divide.
Law.
(
√
)
(
four
)
.990
-
990
÷
9=0
÷
9=0
(
╳
)
(
five
)
.35
×
eight
÷
35
×
8= 1
(
╳
)
3.
Calculate the following questions.
62
+
12
×
six
192
÷
six
+
eight
155
÷
five
×
2
=62
+
72 =32
+
8 =3 1
×
2
= 134 =40 =62
Happy springboard
4.
Comprehensive practice of classroom knowledge
(
1
)
.
Fill in the appropriate number in "□" and list the comprehensive.
Formula.
150-369
÷
9 58
×
13-524
(
2
)
.
How many yellow flowers are there?
36
×
four
+
8= 152
(flower)
(
three
)
.
How much is football more expensive than basketball? (use two
A solution)
square
Method 1:
(
375- 105
)÷
3=90
(yuan)
Method 1:
375
÷
3- 105
÷
3=90
(yuan)
Waiting for your challenge
!
A laundry list of pears, even a laundry list of * * * weight.
100 kg
. Pour one
After half a pear, even a laundry list is heavy.
59 kg
. The original in the laundry list
How many kilograms of pears are there? How much does this laundry list weigh?
Weight of half a pear:
100
-
59=4 1
(kg)
Pear weight:
4 1
×
2=82
Basket weight (kg):
100
-
82= 18
(kg)
2
You Zhu
Sixty-eight
only
There are more cows than pigs.
seven
only
The number of sheep is the number of cattle.
three
double；twofold
Elementary Arithmetic (2)
The second category (
30
minute
)
Xin Kai qidian
(Example
three
Practice one first.
four
~
10
title
)
1.
Write down the number
.
20
×
5- 100=
24+480
÷
6=
104
432-23+55=
464
205
÷
five
×
8=
328
60- 12
×
5=
25
×
18-400
=50
2.
Explore the palace.
(
1
)
.
In the parenthetical two-step mixed operation formula, you need to
First calculate (
Parentheses
)
, and then calculate (
Outside bracket
)
(
2
)
.
according to
500
÷
125=4
4+ 104=408
520-408= 1 12
The comprehensive formula is formed by (
520-
(
500
÷
125+404
)
= 1 12
)
.
(
three
)
.240
×
64-32
÷
eight
If you want to change the operation order,
first
Subtraction must be in parentheses, and the formula should be (
240
×
(
64-32
)÷
eight
)
(
four
)
.
(
53-27
)×
14
The correct pronunciation of is (
53
negative
27
Difference and multiplication
14
What is the product?
)
3.
Read the following formula and calculate.
128- 19
×
4 65+40
÷
5 52
×
23+4
= 128-76 =65+ 8 = 1 196
+
four
=52 =73 = 1200
(
128- 19
)
×
four
(
65+40
)
÷
5 52
×
(
23+47
)
= 109
×
4 = 105
÷
5 =52
×
70
=436 =2 1 =3640
4.
Fill in the appropriate number in □.
Happy springboard
5.
(
1
How much is each football?
(
38+49
)×
6=522
(yuan)
(
2
)
.
Fill in the appropriate figures in □ and make a comprehensive calculation.
Type.
(
127+ 1 13
)
÷
(
five
×
six
)
567
÷
(
276-269
)
(
three
)
.5
How old is mother than her son Xiaoping?
1 1
×(
3- 1
)
=22
(years old)
(
four
)
.
How many people are there on the farm?
Waiting for your challenge
!
A bus runs from city A to city B every hour.
60
Kilometers,
Rows per hour on return
40
Kilometers,
Please take this bus back and forth.
Average speed.
Suppose a,
The two cities are separated.
120
kilometre (km)
(
120
×
2
)÷(
120
÷
60+ 120
÷
40
)
=48
(km)
/
hour