四年级数学下册《小数简便计算》期中易错练习题！.docxVIP

四年级数学下册

四年级数学下册

《小数简便计算》期中易错练习题

43.21+98.76+56.79+1.24

=(43.21+56.79)+(98.76+1.24)

=100+100

=200

6.3+15.4+0.09+3.7+14.6

=(6.3+3.7)+(14.6+15.4)+0.09

=40+0.09

=40.09

34.65－0.99－0.97

=34.65－1－1+(0.01+0.03)

=32.65+0.04

=32.69

19.826－1.173－5.248－3.405

=19.826－(1.173+5.248+3.405)

=19.826－9.826

=10

四年级数学下册

四年级数学下册

《小数简便计算》期中易错练习题

43.21+98.76+56.79+1.24

=(43.21+56.79)+(98.76+1.24)

=100+100

=200

6.3+15.4+0.09+3.7+14.6

=(6.3+3.7)+(14.6+15.4)+0.09

=40+0.09

=40.09

34.65－0.99－0.97

=34.65－1－1+(0.01+0.03)

=32.65+0.04

=32.69

19.826－1.173－5.248－3.405

=19.826－(1.173+5.248+3.405)

=19.826－9.826

=10

四年级数学下册

四年级数学下册

《小数简便计算》期中易错练习题

2.38×4.1+5.8×2.38+0.238

=2.38×4.1+5.8×2.38+2.38×0.1

=2.38×(4.1+5.8+0.1）

=2.38×10

=23.8

100×9.5×0.98+9.5×2

=100×0.98×9.5+9.5×2

=9.5×(98+2）

=9.5×100

=950

28×11.11+99.99×8

=28×11.11+11.11×9×8

=28×11.11+11.11×(9×8)

=11.11×(28+72）

=11.11×100

=1111

四年级数学下册

四年级数学下册

《小数简便计算》期中易错练习题

2.38×4.1+5.8×2.38+0.238

=2.38×4.1+5.8×2.38+2.38×0.1

=2.38×(4.1+5.8+0.1）

=2.38×10

=23.8

100×9.5×0.98+9.5×2

=100×0.98×9.5+9.5×2

=9.5×(98+2）

=9.5×100

=950

28×11.11+99.99×8

=28×11.11+11.11×9×8

=28×11.11+11.11×(9×8)

=11.11×(28+72）

=11.11×100

=1111

四年级数学下册

四年级数学下册

《小数简便计算》期中易错练习题

0.7+2×1.4+2.1+2×0.7

=0.7×1+(2×2)×0.7+0.7×3+2×0.7

=0.7×(1+4+3+2)

=0.7×10

=7

0.38×7.6+0.38÷2.5+0.38×2

=0.38×7.6+0.38×0.4+0.38×2

=0.38×(7.6+0.4+2)

=0.38×10

=3.8

36×2.54+1.8×49.2

=1.8×20×2.54+1.8×49.2

=1.8×(20×2.54)+1.8×49.2

=1.8×(50.8+49.2)

=1.8×100

=180

四年级数学下册

四年级数学下册

《小数简便计算》期中易错练习题

0.7+2×1.4+2.1+2×0.7

=0.7×1+(2×2)×0.7+0.7×3+2×0.7

=0.7×(1+4+3+2)

=0.7×10

=7

0.38×7.6+0.38÷2.5+0.38×2

=0.38×7.6+0.38×0.4+0.38×2

=0.38×(7.6+0.4+2)

=0.38×10

=3.8

36×2.54+1.8×49.2

=1.8×20×2.54+1.8×49.2

=1.8×(20×2.54)+1.8×49.2

=1.8×(50.8+49.2)

=1.8×100

=180