240 elementary arithmetic problems from grade six to grade one.

2.8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4.8× 5/4 + 1/4

5.6÷ 3/8 – 3/8 ÷6

6.4/7 × 5/9 + 3/7 × 5/9

7.5/2 -( 3/2 + 4/5 )

8.7/8 + ( 1/8 + 1/9 )

9.9 × 5/6 + 5/6

10.3/4 × 8/9 - 1/3

1 1.7 × 5/49 + 3/ 14

12.6 ×( 1/2 + 2/3 )

13.8 × 4/5 + 8 × 1 1/5

14.3 1 × 5/6 – 5/6

15.9/7 - ( 2/7 – 10/2 1 )

16.5/9 × 18 – 14 × 2/7

17.4/5 × 25/ 16 + 2/3 × 3/4

18. 14 × 8/7 – 5/6 × 12/ 15

19. 17/32 – 3/4 × 9/24

20.3 × 2/9 + 1/3

2 1.5/7 × 3/25 + 3/7

22.3/ 14 ×× 2/3 + 1/6

23. 1/5 × 2/3 + 5/6

24.9/22 + 1/ 1 1 ÷ 1/2

25.5/3 × 1 1/5 + 4/3

26.45 × 2/3 + 1/3 × 15

27.7/ 19 + 12/ 19 × 5/6

28. 1/4 + 3/4 ÷ 2/3

29.8/7 × 2 1/ 16 + 1/2

30. 10 1 × 1/5 – 1/5 × 2 1

1. orally calculate the following questions.

( 1)58+42= (2)87-45= (3) 125×8=

(4)50× 12= (5)804÷4= (6) 134+66=

(7) 1000-98= (8)720÷5= (9)0÷47=

2. Fill in the operation sequence of the following questions first, and then count.

( 1) 168+36-36+32=

(2) 153-5× 14+83=

(3)50×5÷50×5=

3. Judgment: Mark "√" for the right and "×" for the wrong.

(1)13x15 has the same meaning as15x13. ( )

(2) The calculation result of 3000 ÷ 425 ÷ 8 must be less than 3000÷(425×8). ( )

(3) The product of two factors is 800. If one factor is constant and the other factor is reduced by 20 times, the product is 40. ( )

(4) Formula: "750÷25+35×2" refers to the quotient of 750 divided by 25; Plus 2 times 35, what's the total? ( )

(5)24×25=6×4×25=6+ 100= 106( )

4. Calculate with a simple method:

( 1)3786-499

(2)32×25× 125

(3) 1653-338-662

(4)7987+350+20 13+450

(5)38×38+62×38

(6)452+99×452

(7)20 1×79

(8)50× 125×4×8

5. Calculate the following questions:

( 1)340×( 120-40÷8)

(2)45×(720- 1957÷ 19)

(3)86+[4500+(2088÷36)÷2]

(4)396×[74-(4875÷ 15- 13×2 1)]

(5)[ 1054-( 174- 168)]÷8

(6)6048÷[( 107-99)×9]

6. Solve with comprehensive formula:

What is the quotient of (1)42 minus 28 divided by 14?

(2) What is the sum of 840 minus 480 divided by 240 plus 162?

(3) What is the product of the sum of 258 plus 42 multiplied by 185 minus 158?

(4) What is the quotient of1080 minus the product of 6 and 12 and then divided by 12?

(5) Subtract the product of 60 and 80 from 6000, and then divide the difference by 120. What is the quotient?

(6) How much is the product of12, 18 and 20 more than their sum?

Off-model calculation.

408- 12×24 (46+28)×60 42×50- 17 15÷5

32+ 105÷5 ( 108+47)×52 420×(327-238)

(4 12 1+2389)÷7 67 1× 15-974 469× 12+ 1492

405×(32 13-3 189) 5000-56×23 125×(97-8 1)

6942+480÷3 304×32- 154 20+80÷4-20=

100÷(32-30)×0= 25×4- 12×5=

70×〔(42-42)÷ 18〕= 75×65+75×35=

Calculate the following questions in a simple way.

1、89+ 124+ 1 1+26+48 2、875- 147-23

3.25× 125×40×8 4、 147×8+8×53

5、 125×64 6、0.9+ 1.08+0.92+0. 1

Calculate in a simple way

①89+ 124+ 1 1+26+48 ②875- 147-23

③ 147×8+8×53 ④ 125×64

Calculate the following questions.

1.280+840÷24×5 2.85×(95- 1440÷24)

3.58870÷( 105+20×2) 4.80400-(4300+870÷ 15)

5. 1437×27+27×563 6.8 1432÷( 13×52+78)

7. 125×(33- 1) 8.37.4-(8.6+7.24-6.6)

Do the math. ( 1∶ 1)

( 1) 156× 107-7729 (2)37.85-(7.85+6.4)

(3)287×5+96990÷3 18 (4) 1554÷[(72-58)×3]

exclusive of

2800÷ 100+789 (947-599)+76×64

1.36×(9 13-276÷23) 2.(93+25×2 1)×9

3.507÷ 13×63+498 4.723-(52 1+504)÷25

5.384÷ 12+23×37 1 6.(39-2 1)×(396÷6)

( 1) 156×[( 17.7-7.2)÷3] (2)[37.85-(7.85+6.4)] ×30

(3)28×(5+969.9÷3 18) (4)8 1÷[(72-54)×9]

57× 12-560÷35 848-640÷ 16× 12

960÷( 1500-32×45) [ 192-(54+38)]×67

138×25×4 ( 13× 125)×(3×8) ( 12+24+80)×50 704×25 25×32× 125 32×(25+ 125)

178× 10 1- 178 84×36+64×84 75×99+2×75 83× 102-83×2 98× 199

123× 18- 123×3+85× 123 50×(34×4)×3 25×(24+ 16) 178×99+ 178

79×42+79+79×57 7300÷25÷4 8 100÷4÷75 75×27+ 19×2 5 3 1×870+ 13×3 10

4×(25×65+25×28) 138×25×4 ( 13× 125)×(3×8) ( 12+24+80)×50

25×32× 125 32×(25+ 125) 102×76 58×98

178× 10 1- 178 84×36+64×84 75×99+2×75 83× 102-83×2

98× 199 123× 18- 123×3+85× 123 50×(34×4)×3 25×(24+ 16)

178×99+ 178 79×42+79+79×57 7300÷25÷4 8 100÷4÷75