四年级第一学期“混合运算”专项训练

广东珠海市斗门区第二实验小学 林欣欣

I.Calculation.

(1) (105+27)×3+56=

(2) 360÷(6+3) -17=

(3) 220÷5 -(15×2)=

(4) 309 -12×(8+4)=

(5) (18 -12)÷2×32=

(6) 77+(103×2) -159=

(7) 56+135÷5×30 -75=

(8) 72×30 -200÷25+8=

(9) 600 -(12×15)÷4=

(10) 720÷6 -(140÷5)=

II.Word problems.

(1)Tommy has 5 boxes of chocolates.Each box contains 24 chocolates.If he eats 12 chocolates from each box,how many chocolates does he have left in total?

(2)A toy store has 50 action figures.If they want to display them in rows with 8 figures in each row,how many rows will there be,and how many figures will be left over?

(3)Sarah is planning a birthday party.She needs 45 balloons for decoration.If each pack of balloons contains 12,how many packs does she need to buy,and how many balloons will be left over?

(4)There are 72 students in a school bus.If each row of seats holds 8 students,how many rows are there in the bus,and how many students are left without a seat?

(5)A bakery sold 35 cupcakes in the morning and 21 more in the afternoon.How many cupcakes did they sell in total for the day?

(6)They need to repair 726 meters.They have already repaired 285 meters.If they want to finish the remaining work in one week,how many meters do they need to repair each day?

(7)Emily has 36yuan.She spends 18yuanon a new toy and 7yuanon a book.How much money does she have left?

(8)A car left Shanghai at 8:00 in the morning,traveling at a speed of 55 kilometers per hour,and arrived in Nanjing at 6:00 in the evening.Do you know the distance from Shanghai to Nanjing?

(9)A garden has 60 flowers.If 3 out of 4 flowers are roses,how many flowers are roses,and how many are not roses?

(10)If A,when added to 320,equals B;and if B is added to 460,it is three times A.Find the values of A and B.

(参考答案见本期第51 页)

Keys toWeather Riddles

1.rain 2.lightning 3.snow 4.sun 5.rainbow 6.wind 7.thunder 8.ice 9.cloud 10.moon

Keys toMidsummer Night

I.1.No,they didn’t.2.No,it didn’t.3.No,they didn’t.4.No,she didn’t.5.Yes,they did.

II.1.仲夏之夜 2.确信 3.与……有关系 4.上床睡觉 5.遇到；碰到 6.在拐角处 7.起初；一开始 8.第二天早晨 9.非同寻常的事情 10.看上去愚蠢

III.1.when 2.had 3.knew 4.how 5.something 6.up（注：当兔子坐起来时，身体的高度反而比行走时或睡着时要高，所以此空只能填写“up”。）7.father-in-law 8.because 9.for 10.wore

Keys toBrain Teasers

1.All of them of course! 2.Put it in front of a mirror.3.A clock.4.Tuesday,Thursday,today and tomorrow.5.Your age.6.Nine.7.A glove.8.The letter “m”.9.The letter “e”.10.You took 3 apples so obviously you have 3.