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Answers to the first volume of fourth grade mathematics
1

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