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=
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]
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