最新苏教版数学三年级下册第一单元测试卷及答案
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最新苏教版数学三年级下册第一单元测试卷及答案
___ Unit 1 "Two-Digit n" in Grade 3 Mathematics of the
Newest n of the Su-Jiao-Ban Textbook
Class:___________ Name:___________ Score:_______
I。___(21 points)
1.The product of 15 × 50 has () digits。and the product of 20
× 69 has () digits.
2.Each basketball costs 35 yuan。To buy 4 basketballs。it
costs () yuan。To buy 20 basketballs。it costs () yuan。If Mr。Li
buys 24 basketballs。it costs () yuan.
3.When calculating 23 × 30.you can first calculate () × ()。and then add () to the end of the product.
4.The product of the largest two-digit number and the largest
one-digit number is ()。and the product of the largest two-digit
number and the ___ ().
5.The product of 39 × 42 has () digits。approximately ()。and the product of 41 × 62 is approximately ().
6.___ ">" "<" or "=". 32 × 45 23 × 54 450 × 52 500
56 × 14 28 × 146 10 × 66 10 × 3 × 3
7.Estimate the answers to the following ns。and circle the ns
whose products are less than 5000.
613 × 8
781 × 6
Both are four-digit numbers.
8.A square pond has a side length of 250 meters。Walking
around the pond once is () meters.
II。True or False。(5 points)
1.Multiplying any number by 1 equals that number。and
multiplying 1 by any number equals 1.()2.The product of 840 × 5
has only one digit at the end。()3.The product of a three-digit
number and a one-digit number is always a three-digit number。()4.If neither of the two factors has 5 at the end。then the product
will not have 5 at the end。()5.The product of 24 × 3 × 3 is equal
to the product of 24 × 6.()6.If A × 10 = B × 12.then A。B。()
___(5 points)
1.Estimate: 2□6 × 4 ≈ 1200.() numbers can be filled in the
___. 863 × 4
920 × 7
808 × 6
592 × 8
900 × 6
750 × 8
8.To make the product of □35 × 2 a three-digit number。()
can be filled in the blank。when at least () is filled in the blank。the product is a three-digit number.
①1 ②2 ③8 ④3
2.Each shelf in the school library can hold 32-38 books。If
there are 19 shelves。the total number of books that can be stored
is () books.
①200-400 ②400-600 ③600-800
3.The product of □04 × 2 is a three-digit number。() can be
filled in the blank.
①1-4 ②4-5 ③3-7
4.There are 15 girls in the calligraphy group。and the number
of boys is three times that of the girls。The total number of
students in the calligraphy group is (). ①45 ②60 ③30
5.A running track is 250 meters long。Xiao Ming ran 4 laps。and she ran () meters.
①1000 ②2000 ③2
___(31 points)
1.___(10 points)
40×50可以改写为5×8×5×10，72×10可以改写为8×9×10，15×20可以改写为3×5×4×5，30×32可以改写为3×10×4×8，12×40可以改写为3×4×10×10，10×60可以改写为2×5×6×10，80×40可以改写为8×10×4×10，220×3可以保留不变，44×20可以改写为4×11×2×10，70×13可以保留不变，24×20可以改写为3×8×10，30×90可以改写为3×10×3×3×10，400+600可以改写为1000，15×60可以改写为3×5×4×10，×780可以改写为780.
52×12可以改写为4×13×3×4，75×42可以改写为25×3×7×2×3，48×30可以改写为4×12×3×10，34×26可以保留不变，9×306可以改写为3×3×3×2×17×2，23×68可以改写为4×17×2×23，37×56可以改写为7×2×37×4，84×45可以改写为4×3×5×7×3×4. 8×630可以改写为2×2×3×5×7×3×2，446×4可以改写为2×223×2，72×89可以改写为8×9×2×4×89.
1.___2月份共可加工的零件数为52×29=1508个。
2.684名同学需要的座位数为684÷28≈24.43排，因此不能看同一场电影。
3.大象的体重是2700千克。
4.___从家到书店的距离是家到学校距离的两倍，因此距离为6×2=12分钟×v，解得v=1分钟/米，因此家到书店的距离为12分钟×v=1200米。
5.图书角一共有4×5×40=800本图书。
6.(1) 3台电风扇需要的钱数为3×166=498元，不够。
2) 3台微波炉和1台电风扇需要的钱数为3×240+166=886元。
3) 四件物品总共需要的钱数为93+240+166+504=1003元，不够。
4) 如果买了3台电话机、3台微波炉、3台电风扇和1台吸尘器，需要的钱数为3×93+3×240+3×166+504=2457元。
附加题：填上的数为21.
