五年级计算比赛试题
一、估算
1、489×9≈ 2、902×68≈ 3、587×203≈
4、7146÷90≈ 5、6340÷80≈ 6、511×89≈
7、488×99≈ 8、9021+4897≈ 9、1998÷71≈
10、8077÷80≈ 11、298×407≈ 12、4165÷58≈
二、计算
1、计算结果精确到十分位。(每题1分,共4分)
(1)4.24÷0.12= (2)4.87×6.5=
(3)7.27×5.8= (4)8.27÷24.6=
2、计算结果精确到百分位。(每题1分,共4分)
(1)40÷0.42= (2)7.28×7.6=
(3)9.8 ×0.47= (4)35.47÷26.2=
3、脱式计算。(每题1.5分,共30分)
(1)36.72÷4.25×9.9 (2)194-64.8÷1.8×0.9
= =
(3)405×(3213-3189) (4)0.8×[(10-6.76)÷1.2]
= =
(5) 360×24÷32+730 (6) 2.881÷0.43-0.24×3.5
= =
(7) 33.02-(148.4-90.85)÷2.5 (8) 0.64×25×7.8+2.2
= =
(9)1.5×[1÷(2.1-2.05)] (10) 2.881÷0.43-0.24×3.5
= =
(11) 4÷0.8-0.8÷4 (12) 5.6×165÷0.7÷1.1
= =
(13) [60-(9.5+28.9)]÷0.18
=
(14) 0.78+5.436+14.07×0.86+9.12.5
=
(15) 17÷[(1.2+0.5)×5] (16)3.6÷[1.8×(3.4-2.6)]
= =
(17) 31.5÷0.75÷1.8 (18)2.3+9×(22-19.7)
= =
(19)6.4+0.74+3.7+0.26 (20) 25.2÷[14.2-(7.2+2.8)]
= =
5、用简便方法计算。(写出简算的主要过程)(第1—10题每题2分,第11—16每题3分,共38分)
(1) 1.25×0.32×2.5 (2)1.2×99
= =
(3)0.375×101-37.5 (4)10.1×87
= =
(5)23.7×0.25×8 (6)5.8×(3.87-0.13)+4.2×3.74
= =
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